/* =================================================================================================
* MurrenMenu 
* March, 2003
* Customizable multi-level animated DHTML menus with transparency.
*
* Copyright Aaron Boodman (www.youngpup.net)
* =================================================================================================
* updates:
* 04.19.04 fixed cascade problem with menus nested greater than two levels.
* 12.23.03 added hideCurrent for menu actuators with no menus. renamed to MurrenMenu.
* 04.18.03	fixed render bug in IE 5.0 Mac by removing that browser from compatibility table ;)
*			also made gecko check a little more strict by specifying build no.
* ============================================================================================== */



//==================================================================================================
// Configuration properties
//==================================================================================================
MurrenMenu.rootdir = "/"     // root url of site
MurrenMenu.spacerGif = MurrenMenu.rootdir + "images/spacer.gif";     // path to a transparent spacer gif
MurrenMenu.dingbatOn = MurrenMenu.rootdir + "DesktopModules/Navigator/js/expand-1.gif";            // path to the active sub menu dingbat
MurrenMenu.dingbatOff = MurrenMenu.rootdir + "DesktopModules/Navigator/js/expand-0.gif";          // path to the inactive sub menu dingbat
MurrenMenu.dingbatSize = 14;                            // size of the dingbat (square shape assumed)
MurrenMenu.menuPadding = 5;                             // padding between menu border and items grid
MurrenMenu.itemPadding = 3;                             // additional padding around each item
MurrenMenu.shadowSize = 2;                              // size of shadow under menu
MurrenMenu.shadowOffset = 3;                            // distance shadow should be offset from leading edge
MurrenMenu.shadowColor = "#888";                        // color of shadow (transparency is set in CSS)
MurrenMenu.shadowPng = "img/grey-40.png";               // a PNG graphic to serve as the shadow for mac IE5
MurrenMenu.backgroundColor = "white";                   // color of the background (transparency set in CSS)
MurrenMenu.backgroundPng = "img/white-90.png";          // a PNG graphic to server as the background for mac IE5
MurrenMenu.hideDelay = 1000;                            // number of milliseconds to wait before hiding a menu
MurrenMenu.slideTime = 300;                             // number of milliseconds it takes to open and close a menu

//==================================================================================================
// Internal use properties
//==================================================================================================
MurrenMenu.reference = { topLeft: 1, topRight: 2, bottomLeft: 3, bottomRight: 4 };
MurrenMenu.direction = { down: 1, right: 2 };
MurrenMenu.registry = [];
MurrenMenu._maxZ = 100;



//==================================================================================================
// Static methods
//==================================================================================================
// supporting win ie5+, mac ie5.1+ and gecko >= mozilla 1.0
MurrenMenu.isSupported = function() {
    var ua = navigator.userAgent.toLowerCase();
    var pf = navigator.platform.toLowerCase();
    var an = navigator.appName;
    var rtn = false;

    if (ua.indexOf("gecko") > -1 && navigator.productSub >= 20020605) rtn = true; // gecko >= moz 1.0
    else if (an == "Microsoft Internet Explorer") {
        if (document.getElementById) { // ie5.1+ mac,win
            if (pf.indexOf("mac") == 0) {
                rtn = /msie (\d(.\d*)?)/.test(ua) && Number(RegExp.$1) >= 5.1;
            }
            else rtn = true;
        }
    }
    return rtn;
}

// call this in onload once menus have been created
MurrenMenu.initialize = function() {
    for (var i = 0, murren_menu = null; murren_menu = this.registry[i]; i++) {
        murren_menu.initialize();
    }
}

// call this in document body to write out menu html
MurrenMenu.renderAll = function() {
    var aMenuHtml = [];
    for (var i = 0, murren_menu = null; murren_menu = this.registry[i]; i++) {
        aMenuHtml[i] = murren_menu.murren_toString();
    }
    document.write(aMenuHtml.join(""));
}

//==================================================================================================
// MurrenMenu constructor (only called internally)
//==================================================================================================
// oActuator            : The thing that causes the menu to be shown when it is mousedover. Either a
//                        reference to an HTML element, or a MurrenMenuItem from an existing menu.
// iDirection           : The direction to slide out. One of MurrenMenu.direction.
// iLeft                : Left pixel offset of menu from actuator
// murren_iTop                 : Top pixel offset of menu from actuator
// iReferencePoint      : Corner of actuator to measure from. One of MurrenMenu.referencePoint.
// parentMenuSet        : Menuset this menu will be added to.
//==================================================================================================
function MurrenMenu(oActuator, iDirection, iLeft, murren_iTop, iReferencePoint, parentMenuSet) {
    // public methods
    this.addItem = addItem;
    this.addMenu = addMenu;
    this.murren_toString = murren_toString;
    this.initialize = initialize;
    this.isOpen = false;
    this.murren_show = murren_show;
    this.murren_hide = murren_hide;
    this.items = [];

    // events
    this.onactivate = new Function();       // when the menu starts to slide open
    this.ondeactivate = new Function();     // when the menu finishes sliding closed
    this.onmouseover = new Function();      // when the menu has been moused over
    this.onqueue = new Function();          // hack .. when the menu sets a timer to be closed a little while in the future
    this.ondequeue = new Function();

    // initialization
    this.index = MurrenMenu.registry.length;
    MurrenMenu.registry[this.index] = this;

    var id = "MurrenMenu" + this.index;
    var contentHeight = null;
    var contentWidth = null;
    var childMenuSet = null;
    var animating = false;
    var childMenus = [];
    var slideAccel = -1;
    var elmCache = null;
    var ready = false;
    var _this = this;
    var a = null;

    var pos = iDirection == MurrenMenu.direction.down ? "top" : "left";
    var dim = null;

    // private and public method implimentations
    function addItem(murren_sText, murren_sUrl, murren_icon) {
        var item = new MurrenMenuItem(murren_sText, murren_sUrl, murren_icon, this);
        item._index = this.items.length;
        this.items[item._index] = item;
    }

    function addMenu(oMenuItem) {
        if (!oMenuItem.parentMenu == this) throw new Error("Cannot add a menu here");

        if (childMenuSet == null) childMenuSet = new MurrenMenuSet(MurrenMenu.direction.right, -5, 2, MurrenMenu.reference.topRight);

        var m = childMenuSet.addMenu(oMenuItem);

        childMenus[oMenuItem._index] = m;
        m.onmouseover = child_mouseover;
        m.ondeactivate = child_deactivate;
        m.onqueue = child_queue;
        m.ondequeue = child_dequeue;

        return m;
    }

    function initialize() {
        initCache();
        initEvents();
        initSize();
        ready = true;
    }

    function murren_show() {

        if (ready) {
            _this.isOpen = true;
            animating = true;
            setContainerPos();
            elmCache["clip"].style.visibility = "visible";
            elmCache["clip"].style.zIndex = MurrenMenu._maxZ++;
            //dbg_dump("maxZ: " + MurrenMenu._maxZ);
            slideStart();
            _this.onactivate();
        }
    }

    function murren_hide() {
        if (ready) {
            _this.isOpen = false;
            animating = true;

            for (var i = 0, item = null; item = elmCache.item[i]; i++)
                dehighlight(item);

            if (childMenuSet) childMenuSet.murren_hide();

            slideStart();
            _this.ondeactivate();
        }
    }

    function setContainerPos() {
        var sub = oActuator.constructor == MurrenMenuItem;
        var act = sub ? oActuator.parentMenu.elmCache["item"][oActuator._index] : oActuator;
        var el = act;

        var x = 0;
        var y = 0;


        var minX = 0;
        var maxX = (window.innerWidth ? window.innerWidth : document.body.clientWidth) - parseInt(elmCache["clip"].style.width);
        var minY = 0;
        var maxY = (window.innerHeight ? window.innerHeight : document.body.clientHeight) - parseInt(elmCache["clip"].style.height);

        // add up all offsets... subtract any scroll offset
        while (sub ? el.parentNode.className.indexOf("MurrenMenu") == -1 : el.offsetParent) {
            x += el.offsetLeft;
            y += el.offsetTop;

            if (el.scrollLeft) x -= el.scrollLeft;
            if (el.scrollTop) y -= el.scrollTop;

            el = el.offsetParent;
        }

        if (oActuator.constructor == MurrenMenuItem) {
            x += parseInt(el.parentNode.style.left);
            y += parseInt(el.parentNode.style.top);
        }

        switch (iReferencePoint) {
            case MurrenMenu.reference.topLeft:
                break;
            case MurrenMenu.reference.topRight:
                x += act.offsetWidth;
                break;
            case MurrenMenu.reference.bottomLeft:
                y += act.offsetHeight;
                break;
            case MurrenMenu.reference.bottomRight:
                x += act.offsetWidth;
                y += act.offsetHeight;
                break;
        }

        x += iLeft;
        y += murren_iTop;

        x = Math.max(Math.min(x, maxX), minX);
        y = Math.max(Math.min(y, maxY), minY);

        elmCache["clip"].style.left = x + "px";
        elmCache["clip"].style.top = y + "px";
    }

    function slideStart() {
        var x0 = parseInt(elmCache["content"].style[pos]);
        var x1 = _this.isOpen ? 0 : -dim;

        if (a != null) a.stop();
        a = new Accelimation(x0, x1, MurrenMenu.slideTime, slideAccel);

        a.onframe = slideFrame;
        a.onend = slideEnd;

        a.start();
    }

    function slideFrame(x) {
        elmCache["content"].style[pos] = x + "px";
    }

    function slideEnd() {
        if (!_this.isOpen) elmCache["clip"].style.visibility = "hidden";
        animating = false;
    }

    function initSize() {
        // everything is based off the size of the items table...
        var ow = elmCache["items"].offsetWidth;
        var oh = elmCache["items"].offsetHeight;
        var ua = navigator.userAgent.toLowerCase();

        // clipping container should be ow/oh + the size of the shadow
        elmCache["clip"].style.width = ow + MurrenMenu.shadowSize + 2 + "px";
        elmCache["clip"].style.height = oh + MurrenMenu.shadowSize + 2 + "px";

        // same with content...
        elmCache["content"].style.width = ow + MurrenMenu.shadowSize + "px";
        elmCache["content"].style.height = oh + MurrenMenu.shadowSize + "px";

        contentHeight = oh + MurrenMenu.shadowSize;
        contentWidth = ow + MurrenMenu.shadowSize;

        dim = iDirection == MurrenMenu.direction.down ? contentHeight : contentWidth;

        // set initially closed
        elmCache["content"].style[pos] = -dim - MurrenMenu.shadowSize + "px";
        elmCache["clip"].style.visibility = "hidden";

        // if *not* mac/ie 5
        if (ua.indexOf("mac") == -1 || ua.indexOf("gecko") > -1) {
            // set background div to offset size
            elmCache["background"].style.width = ow + "px";
            elmCache["background"].style.height = oh + "px";
            elmCache["background"].style.backgroundColor = MurrenMenu.backgroundColor;

            // shadow left starts at offset left and is offsetHeight pixels high
            elmCache["shadowRight"].style.left = ow + "px";
            elmCache["shadowRight"].style.height = oh - (MurrenMenu.shadowOffset - MurrenMenu.shadowSize) + "px";
            elmCache["shadowRight"].style.backgroundColor = MurrenMenu.shadowColor;

            // shadow bottom starts at offset height and is offsetWidth - shadowOffset 
            // pixels wide (we don't want the bottom and right shadows to overlap or we 
            // get an extra bright bottom-right corner)
            elmCache["shadowBottom"].style.top = oh + "px";
            //elmCache["shadowBottom"].style.width = (ow - MurrenMenu.shadowOffset) + "px";
            elmCache["shadowBottom"].style.backgroundColor = MurrenMenu.shadowColor;
        }
        // mac ie is a little different because we use a PNG for the transparency
        else {
            // set background div to offset size
            elmCache["background"].firstChild.src = MurrenMenu.backgroundPng;
            elmCache["background"].firstChild.width = ow;
            elmCache["background"].firstChild.height = oh;

            // shadow left starts at offset left and is offsetHeight pixels high
            elmCache["shadowRight"].firstChild.src = MurrenMenu.shadowPng;
            elmCache["shadowRight"].style.left = ow + "px";
            elmCache["shadowRight"].firstChild.width = MurrenMenu.shadowSize;
            elmCache["shadowRight"].firstChild.height = oh - (MurrenMenu.shadowOffset - MurrenMenu.shadowSize);

            // shadow bottom starts at offset height and is offsetWidth - shadowOffset 
            // pixels wide (we don't want the bottom and right shadows to overlap or we 
            // get an extra bright bottom-right corner)
            elmCache["shadowBottom"].firstChild.src = MurrenMenu.shadowPng;
            elmCache["shadowBottom"].style.top = oh + "px";
            elmCache["shadowBottom"].firstChild.height = MurrenMenu.shadowSize;
            elmCache["shadowBottom"].firstChild.width = ow - MurrenMenu.shadowOffset;
        }
    }

    function initCache() {
        var murren_menu = document.getElementById(id);
        var murren_all = murren_menu.murren_all ? murren_menu.murren_all : murren_menu.getElementsByTagName("*"); // IE/win doesn't support * syntax, but does have the document.all thing

        elmCache = {};
        elmCache["clip"] = murren_menu;
        elmCache["item"] = [];

        for (var i = 0, elm = null; elm = murren_all[i]; i++) {
            switch (elm.className) {
                case "items":
                case "content":
                case "background":
                case "shadowRight":
                case "shadowBottom":
                    elmCache[elm.className] = elm;
                    break;
                case "item":
                    elm._index = elmCache["item"].length;
                    elmCache["item"][elm._index] = elm;
                    break;
            }
        }

        // hack!
        _this.elmCache = elmCache;
    }

    function initEvents() {
        // hook item mouseover
        for (var i = 0, item = null; item = elmCache.item[i]; i++) {
            item.onmouseover = item_mouseover;
            item.onmouseout = item_mouseout;
            item.onclick = item_click;
        }

        // hook actuation
        if (typeof oActuator.tagName != "undefined") {
            oActuator.onmouseover = actuator_mouseover;
            oActuator.onmouseout = actuator_mouseout;
        }

        // hook menu mouseover
        elmCache["content"].onmouseover = content_mouseover;
        elmCache["content"].onmouseout = content_mouseout;
    }

    function highlight(oRow) {
        oRow.className = "item hover";
        if (childMenus[oRow._index])
            oRow.lastChild.firstChild.src = MurrenMenu.dingbatOn;
    }

    function dehighlight(oRow) {
        oRow.className = "item";
        if (childMenus[oRow._index])
            oRow.lastChild.firstChild.src = MurrenMenu.dingbatOff;
    }

    function item_mouseover() {
        if (!animating) {
            highlight(this);

            if (childMenus[this._index])
                childMenuSet.showMenu(childMenus[this._index]);
            else if (childMenuSet) childMenuSet.murren_hide();
        }
    }

    function item_mouseout() {
        if (!animating) {
            if (childMenus[this._index])
                childMenuSet.hideMenu(childMenus[this._index]);
            else    // otherwise child_deactivate will do this
                dehighlight(this);
        }
    }

    function item_click() {
        if (!animating) {
            if (_this.items[this._index].url)
                location.href = _this.items[this._index].url;
        }
    }

    function actuator_mouseover() {
        parentMenuSet.showMenu(_this);
    }

    function actuator_mouseout() {
        parentMenuSet.hideMenu(_this);
    }

    function content_mouseover() {
        if (!animating) {
            parentMenuSet.showMenu(_this);
            _this.onmouseover();
        }
    }

    function content_mouseout() {
        if (!animating) {
            parentMenuSet.hideMenu(_this);
        }
    }

    function child_mouseover() {
        if (!animating) {
            parentMenuSet.showMenu(_this);
        }
    }

    function child_deactivate() {
        for (var i = 0; i < childMenus.length; i++) {
            if (childMenus[i] == this) {
                dehighlight(elmCache["item"][i]);
                break;
            }
        }
    }

    function child_queue() {
        parentMenuSet.hideMenu(_this);
    }

    function child_dequeue() {
        parentMenuSet.showMenu(_this);
    }

    function murren_toString() {
        var aHtml = [];
        var sClassName = "MurrenMenu" + (oActuator.constructor != MurrenMenuItem ? " top" : "");

        for (var i = 0, item = null; item = this.items[i]; i++) {
            aHtml[i] = item.murren_toString(childMenus[i]);
        }

        return '<div id="' + id + '" class="' + sClassName + '">' +
                        '<div class="content"><table class="items" cellpadding="0" cellspacing="0" border="0">' +
                        '<tr><td colspan="2"><img src="' + MurrenMenu.spacerGif + '" width="1" height="' + MurrenMenu.menuPadding + '"></td></tr>' +
                        aHtml.join('') +
                        '<tr><td colspan="2"><img src="' + MurrenMenu.spacerGif + '" width="1" height="' + MurrenMenu.menuPadding + '"></td></tr></table>' +
                        '<div class="shadowBottom"><img src="' + MurrenMenu.spacerGif + '" width="1" height="1"></div>' +
                        '<div class="shadowRight"><img src="' + MurrenMenu.spacerGif + '" width="1" height="1"></div>' +
		        '<div class="background"><img src="' + MurrenMenu.spacerGif + '" width="1" height="1"></div>' +
	                '</div></div>';
    }
}


//==================================================================================================
// MurrenMenuSet
//==================================================================================================
// iDirection           : The direction to slide out. One of MurrenMenu.direction.
// iLeft                : Left pixel offset of menus from actuator
// murren_iTop                 : Top pixel offset of menus from actuator
// iReferencePoint      : Corner of actuator to measure from. One of MurrenMenu.referencePoint.
//==================================================================================================
MurrenMenuSet.registry = [];

function MurrenMenuSet(iDirection, iLeft, murren_iTop, iReferencePoint) {
    // public methods
    this.addMenu = addMenu;
    this.showMenu = showMenu;
    this.hideMenu = hideMenu;
    this.murren_hide = murren_hide;
    this.hideCurrent = hideCurrent;

    // initialization
    var menus = [];
    var _this = this;
    var current = null;

    this.index = MurrenMenuSet.registry.length;
    MurrenMenuSet.registry[this.index] = this;

    // method implimentations...
    function addMenu(oActuator) {
        var m = new MurrenMenu(oActuator, iDirection, iLeft, murren_iTop, iReferencePoint, this);
        menus[menus.length] = m;
        return m;
    }

    function showMenu(murren_oMenu) {
        if (murren_oMenu != current) {
            // close currently open menu
            if (current != null) murren_hide(current);

            // set current menu to this one
            current = murren_oMenu;

            // if this menu is closed, open it
            murren_oMenu.murren_show();
        }
        else {
            // hide pending calls to close this menu
            cancelHide(murren_oMenu);
        }
    }

    function hideMenu(murren_oMenu) {
        //dbg_dump("hideMenu a " + murren_oMenu.index);
        if (current == murren_oMenu && murren_oMenu.isOpen) {
            //dbg_dump("hideMenu b " + murren_oMenu.index);
            if (!murren_oMenu.hideTimer) scheduleHide(murren_oMenu);
        }
    }

    function scheduleHide(murren_oMenu) {
        //dbg_dump("scheduleHide " + murren_oMenu.index);
        murren_oMenu.onqueue();
        murren_oMenu.hideTimer = window.setTimeout("MurrenMenuSet.registry[" + _this.index + "].murren_hide(MurrenMenu.registry[" + murren_oMenu.index + "])", MurrenMenu.hideDelay);
    }

    function cancelHide(murren_oMenu) {
        //dbg_dump("cancelHide " + murren_oMenu.index);
        if (murren_oMenu.hideTimer) {
            murren_oMenu.ondequeue();
            window.clearTimeout(murren_oMenu.hideTimer);
            murren_oMenu.hideTimer = null;
        }
    }

    function murren_hide(murren_oMenu) {
        if (!murren_oMenu && current) murren_oMenu = current;

        if (murren_oMenu && current == murren_oMenu && murren_oMenu.isOpen) {
            hideCurrent();
        }
    }

    function hideCurrent() {
        if (null != current) {
            cancelHide(current);
            current.hideTimer = null;
            current.murren_hide();
            current = null;
        }
    }
}

//==================================================================================================
// MurrenMenuItem (internal)
// represents an item in a dropdown
//==================================================================================================
// murren_sText        : The item display text
// murren_sUrl         : URL to load when the item is clicked
// murren_oParent      : Menu this item is a part of
//==================================================================================================
function MurrenMenuItem(murren_sText, murren_sUrl, murren_icon, murren_oParent) {
    this.murren_toString = murren_toString;
    this.text = murren_sText;
    this.url = murren_sUrl;
    this.parentMenu = murren_oParent;

    function murren_toString(bDingbat) {
        var sDingbat = bDingbat ? MurrenMenu.dingbatOff : MurrenMenu.spacerGif;
        var iEdgePadding = MurrenMenu.itemPadding + MurrenMenu.menuPadding;
        var sPaddingLeft = "padding:" + MurrenMenu.itemPadding + "px; padding-left:" + iEdgePadding + "px;"
        var sPaddingRight = "padding:" + MurrenMenu.itemPadding + "px; padding-right:" + iEdgePadding + "px;"
        var sIconfile = murren_icon ? '<img src="' + MurrenMenu.rootdir + 'images/' + murren_icon + '"></td><td nowrap>' : '&nbsp;</td><td nowrap>';
        return '<tr class="item"><td nowrap style="' + sPaddingLeft + '">' + sIconfile +
                        murren_sText + '</td><td width="14" style="' + sPaddingRight + '">' +
                        '<img src="' + sDingbat + '" width="14" height="14"></td></tr>';
    }
}






//=====================================================================
// Accel[erated] [an]imation object
// change a property of an object over time in an accelerated fashion
//=====================================================================
// obj  : reference to the object whose property you'd like to animate
// prop : property you would like to change eg: "left"
// to   : final value of prop
// time : time the animation should take to run
// zip	: optional. specify the zippiness of the acceleration. pick a 
//		  number between -1 and 1 where -1 is full decelerated, 1 is 
//		  full accelerated, and 0 is linear (no acceleration). default
//		  is 0.
// unit	: optional. specify the units for use with prop. default is 
//		  "px".
//=====================================================================
// bezier functions lifted from the lib_animation.js file in the 
// 13th Parallel API. www.13thparallel.org
//=====================================================================

function Accelimation(from, to, time, zip) {
    if (typeof zip == "undefined") zip = 0;
    if (typeof unit == "undefined") unit = "px";

    this.x0 = from;
    this.x1 = to;
    this.dt = time;
    this.zip = -zip;
    this.unit = unit;
    this.timer = null;
    this.onend = new Function();
    this.onframe = new Function();
}



//=====================================================================
// public methods
//=====================================================================

// after you create an accelimation, you call this to start it-a runnin'
Accelimation.prototype.start = function() {
    this.t0 = new Date().getTime();
    this.t1 = this.t0 + this.dt;
    var dx = this.x1 - this.x0;
    this.c1 = this.x0 + ((1 + this.zip) * dx / 3);
    this.c2 = this.x0 + ((2 + this.zip) * dx / 3);
    Accelimation._add(this);
}

// and if you need to stop it early for some reason...
Accelimation.prototype.stop = function() {
    Accelimation._remove(this);
}



//=====================================================================
// private methods
//=====================================================================

// paints one frame. gets called by Accelimation._paintAll.
Accelimation.prototype._paint = function(time) {
    if (time < this.t1) {
        var elapsed = time - this.t0;
        this.onframe(Accelimation._getBezier(elapsed / this.dt, this.x0, this.x1, this.c1, this.c2));
    }
    else this._end();
}

// ends the animation
Accelimation.prototype._end = function() {
    Accelimation._remove(this);
    this.onframe(this.x1);
    this.onend();
}




//=====================================================================
// static methods (all private)
//=====================================================================

// add a function to the list of ones to call periodically
Accelimation._add = function(o) {
    var index = this.instances.length;
    this.instances[index] = o;
    // if this is the first one, start the engine
    if (this.instances.length == 1) {
        this.timerID = window.setInterval("Accelimation._paintAll()", this.targetRes);
    }
}

// remove a function from the list
Accelimation._remove = function(o) {
    for (var i = 0; i < this.instances.length; i++) {
        if (o == this.instances[i]) {
            this.instances = this.instances.slice(0, i).concat(this.instances.slice(i + 1));
            break;
        }
    }
    // if that was the last one, stop the engine
    if (this.instances.length == 0) {
        window.clearInterval(this.timerID);
        this.timerID = null;
    }
}

// "engine" - call each function in the list every so often
Accelimation._paintAll = function() {
    var now = new Date().getTime();
    for (var i = 0; i < this.instances.length; i++) {
        this.instances[i]._paint(now);
    }
}


// Bezier functions:
Accelimation._B1 = function(t) { return t * t * t }
Accelimation._B2 = function(t) { return 3 * t * t * (1 - t) }
Accelimation._B3 = function(t) { return 3 * t * (1 - t) * (1 - t) }
Accelimation._B4 = function(t) { return (1 - t) * (1 - t) * (1 - t) }


//Finds the coordinates of a point at a certain stage through a bezier curve
Accelimation._getBezier = function(percent, startPos, endPos, control1, control2) {
    return endPos * this._B1(percent) + control2 * this._B2(percent) + control1 * this._B3(percent) + startPos * this._B4(percent);
}


//=====================================================================
// static properties
//=====================================================================

Accelimation.instances = [];
Accelimation.targetRes = 10;
Accelimation.timerID = null;


//=====================================================================
// IE win memory cleanup
//=====================================================================

//if (window.attachEvent) {
//    var cearElementProps = [
//		'data',
//		'onmouseover',
//		'onmouseout',
//		'onmousedown',
//		'onmouseup',
//		'ondblclick',
//		'onclick',
//		'onselectstart',
//		'oncontextmenu'
//	];
//
//    window.attachEvent("onunload", function() {
//        var el;
//		for (var d = document.murren_all.length; d--; ) {
//			el = document.murren_all[d];
//			for (var c = cearElementProps.length; c--; ) {
//				el[cearElementProps[c]] = null;
//			}
//		}
//    });
//}