/* =================================================================================================
*
* Copyright 2003, Aaron Boodman (aaron@youngpup.net)
* =================================================================================================
*  
* Use of this library is governed by the Creative Commons Attribution-NonCommercial-ShareAlike 1.0
* License. You can check it out at: http://creativecommons.org/licenses/by-nc-sa/1.0
*
* Basically:
* - You may copy, distribute, and eat this code as you wish. But you must give me credit for 
* writing it. You may not misrepresent yourself as the author of this code.
* - You may not use this code in a commercial setting without prior consent from me.
* - If you make changes to this code, you must make the changes available under a license like
* this one.
* ============================================================================================== */



mcDropDown.spacerGif = "/images/nav/bp/x.gif"; 
mcDropDown.dingbatOn = "/images/nav/bp/expand-1.gif"; 
mcDropDown.dingbatOff = "/images/nav/bp/expand-0.gif"; 
mcDropDown.dingbatSize = 14; 
mcDropDown.menuPadding = 1; 
mcDropDown.itemPadding = 4; 
mcDropDown.shadowSize = 2; 
mcDropDown.shadowOffset = 3; 
mcDropDown.shadowColor = "#888"; 
mcDropDown.shadowPng = "grey-40.png"; 
mcDropDown.backgroundColor = "white"; 
mcDropDown.backgroundPng = "white-90.png"; 
mcDropDown.hideDelay = 1000; 
mcDropDown.slideTime = 200; 



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




mcDropDown.isSupported = function() 
{
    if (typeof mcDropDown.isSupported.r == "boolean") 
        return mcDropDown.isSupported.r;
    
    var ua = navigator.userAgent.toLowerCase();
    var an = navigator.appName;
    var r = false;
    if (ua.indexOf("gecko") > -1) 
        r = true; 
    else 
    if (an == "Microsoft Internet Explorer") {
        if (document.getElementById) 
            r = true; 
    }
    mcDropDown.isSupported.r = r;
    return r;
}

mcDropDown.initialize = function() 
{
    for (var i = 0, menu = null; menu = this.registry[i]; i++) {
        menu.initialize();
    }
}

mcDropDown.renderAll = function() 
{
    var aMenuHtml = [];
    for (var i = 0, menu = null; menu = this.registry[i]; i++) {
        aMenuHtml[i] = menu.toString();
    }
    document.write(aMenuHtml.join(""));
}

function mcDropDown(oActuator, iDirection, iLeft, iTop, iReferencePoint, parentMenuSet) 
{
    this.addItem = addItem;
    this.addMenu = addMenu;
    this.toString = toString;
    this.initialize = initialize;
    this.isOpen = false;
    this.show = show;
    this.hide = hide;
    this.items = [];

    this.onactivate = new Function(); 
    this.ondeactivate = new Function(); 
    this.onmouseover = new Function(); 
    this.onqueue = new Function(); 

    this.index = mcDropDown.registry.length;
    mcDropDown.registry[this.index] = this;
    var id = "mcDropDown" + 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 == mcDropDown.direction.down ? "top" : "left";
    var dim = null;

    function addItem(sText, sUrl) 
    {
        var item = new mcDropDownItem(sText, sUrl, 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 mcDropDownSet(mcDropDown.direction.right, -5, 2, mcDropDown.reference.topRight);
        var m = childMenuSet.addMenu(oMenuItem);
        childMenus[oMenuItem._index] = m;
        m.onmouseover = child_mouseover;
        m.ondeactivate = child_deactivate;
        m.onqueue = child_queue;
        return m;
    }
    
    function initialize() 
    {
        initCache();
        initEvents();
        initSize();
        ready = true;
    }

    function show() 
    {
        if (ready) {
            _this.isOpen = true;
            animating = true;
            setContainerPos();
            elmCache["clip"].style.visibility = "visible";
            elmCache["clip"].style.zIndex = mcDropDown._maxZ++;

            slideStart();
            _this.onactivate();
        }
    }

    function hide() 
    {
        if (ready) {
            _this.isOpen = false;
            animating = true;
            for (var i = 0, item = null; item = elmCache.item[i]; i++) 
            dehighlight(item);
            if (childMenuSet) childMenuSet.hide();
            slideStart();
            _this.ondeactivate();
        }
    }

    function setContainerPos() 
    {
        var sub = oActuator.constructor == mcDropDownItem; 
        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);

        while (sub ? el.parentNode.className.indexOf("mcDropdownMenu") == -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 == mcDropDownItem) 
        {
            x += parseInt(el.parentNode.style.left);
            y += parseInt(el.parentNode.style.top);
        }
        
        switch (iReferencePoint) 
        {
            case mcDropDown.reference.topLeft:
                break;
            case mcDropDown.reference.topRight:
                x += act.offsetWidth;
                break;
            case mcDropDown.reference.bottomLeft:
                y += act.offsetHeight;
                break;
            case mcDropDown.reference.bottomRight:
                x += act.offsetWidth;
                y += act.offsetHeight;
                break;
        }
        x += iLeft;
        y += 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, mcDropDown.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() 
    {        
        var ow = elmCache["items"].offsetWidth;
        var oh = elmCache["items"].offsetHeight;
        var ua = navigator.userAgent.toLowerCase();

        elmCache["clip"].style.width = ow + mcDropDown.shadowSize + 2 + "px";
        elmCache["clip"].style.height = oh + mcDropDown.shadowSize + 2 + "px";

        elmCache["content"].style.width = ow + mcDropDown.shadowSize + "px";
        elmCache["content"].style.height = oh + mcDropDown.shadowSize + "px";
        contentHeight = oh + mcDropDown.shadowSize;
        contentWidth = ow + mcDropDown.shadowSize;
        dim = iDirection == mcDropDown.direction.down ? contentHeight : contentWidth;

        elmCache["content"].style[pos] = -dim - mcDropDown.shadowSize + "px";
        elmCache["clip"].style.visibility = "hidden";

        if (ua.indexOf("mac") == -1 || ua.indexOf("gecko") > -1) 
        {   
            elmCache["background"].style.width = ow + "px";
            elmCache["background"].style.height = oh + "px";
            elmCache["background"].style.backgroundColor = mcDropDown.backgroundColor;            

            elmCache["shadowRight"].style.left = ow + "px";
            elmCache["shadowRight"].style.height = oh - (mcDropDown.shadowOffset - mcDropDown.shadowSize) + "px";            
            elmCache["shadowRight"].style.backgroundColor = mcDropDown.shadowColor;

            elmCache["shadowBottom"].style.top = oh + "px";
            elmCache["shadowBottom"].style.width = ow - mcDropDown.shadowOffset + "px";
            elmCache["shadowBottom"].style.backgroundColor = mcDropDown.shadowColor;
        }

        else {                    
            elmCache["background"].firstChild.src = mcDropDown.backgroundPng;
            elmCache["background"].firstChild.width = ow;
            elmCache["background"].firstChild.height = oh;

            elmCache["shadowRight"].firstChild.src = mcDropDown.shadowPng;
            elmCache["shadowRight"].style.left = ow + "px";
            elmCache["shadowRight"].firstChild.width = mcDropDown.shadowSize;
            elmCache["shadowRight"].firstChild.height = oh - (mcDropDown.shadowOffset - mcDropDown.shadowSize);



            elmCache["shadowBottom"].firstChild.src = mcDropDown.shadowPng;
            elmCache["shadowBottom"].style.top = oh + "px";
            elmCache["shadowBottom"].firstChild.height = mcDropDown.shadowSize;
            elmCache["shadowBottom"].firstChild.width = ow - mcDropDown.shadowOffset;
        }
    }

    function initCache() 
    {
        var menu = document.getElementById(id);
        var all = menu.all ? menu.all : menu.getElementsByTagName("*"); 
        elmCache = {};
        elmCache["clip"] = menu;
        elmCache["item"] = [];
        for (var i = 0, elm = null; elm = 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;
            }
        }

        _this.elmCache = elmCache;
    }

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

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

        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 = mcDropDown.dingbatOn;
    }
    
    function dehighlight(oRow) 
    {
        oRow.className = "item";
        if (childMenus[oRow._index]) 
            oRow.lastChild.firstChild.src = mcDropDown.dingbatOff;
    }
    
    function item_mouseover() 
    {
        if (!animating) {
            highlight(this);
            if (childMenus[this._index]) 
                childMenuSet.showMenu(childMenus[this._index]);
            else if (childMenuSet) 
                childMenuSet.hide();
        }
    }
    
    function item_mouseout() {
        if (!animating) {
            if (childMenus[this._index])
                childMenuSet.hideMenu(childMenus[this._index]);
            else 
            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 toString() {
        var aHtml = [];
        var sClassName = "mcDropdownMenu" + (oActuator.constructor != mcDropDownItem ? " top" : "");
        for (var i = 0, item = null; item = this.items[i]; i++) {
            aHtml[i] = item.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="' + mcDropDown.spacerGif + '" width="1" height="' + mcDropDown.menuPadding + '"></td></tr>' + 
                aHtml.join('') + 
                '<tr><td colspan="2"><img src="' + mcDropDown.spacerGif + '" width="1" height="' + mcDropDown.menuPadding + '"></td></tr></table>' + 
                '<div class="shadowBottom"><img src="' + mcDropDown.spacerGif + '" width="1" height="1"></div>' + 
                '<div class="shadowRight"><img src="' + mcDropDown.spacerGif + '" width="1" height="1"></div>' + 
                '<div class="background"><img src="' + mcDropDown.spacerGif + '" width="1" height="1"></div>' + 
                '</div></div>';
    }
}



mcDropDownSet.registry = [];
function mcDropDownSet(iDirection, iLeft, iTop, iReferencePoint) 
{

    this.addMenu = addMenu;
    this.showMenu = showMenu;
    this.hideMenu = hideMenu;
    this.hide = hide;

    var menus = [];
    var _this = this;
    var current = null;
    this.index = mcDropDownSet.registry.length;
    mcDropDownSet.registry[this.index] = this;

    function addMenu(oActuator) {
    var m = new mcDropDown(oActuator, iDirection, iLeft, iTop, iReferencePoint, this);
    menus[menus.length] = m;
    return m;
    }
    
    function showMenu(oMenu) 
    {
        if (oMenu != current) {
            if (current != null) hide(current); 
            current = oMenu;
            oMenu.show();
        }
        else {  
            cancelHide(oMenu);
        }
    }
    
    function hideMenu(oMenu) 
    {
        if (current == oMenu && oMenu.isOpen) {
            if (!oMenu.hideTimer) scheduleHide(oMenu);
        }
    }
    
    function scheduleHide(oMenu) 
    {
        oMenu.onqueue();
        oMenu.hideTimer = window.setTimeout("mcDropDownSet.registry[" + _this.index + "].hide(mcDropDown.registry[" + oMenu.index + "])", mcDropDown.hideDelay);
    }
    
    function cancelHide(oMenu)
    {
        if (oMenu.hideTimer) {
            window.clearTimeout(oMenu.hideTimer);
            oMenu.hideTimer = null;
        }
    }
    
    function hide(oMenu) 
    { 
        if (!oMenu && current) oMenu = current;
        if (oMenu && current == oMenu && oMenu.isOpen) 
        {
            cancelHide(oMenu);
            current = null;
            oMenu.hideTimer = null;
            oMenu.hide();
        }
    }
}

function mcDropDownItem(sText, sUrl, oParent) 
{
    this.toString = toString;
    this.text = sText;
    this.url = sUrl;
    this.parentMenu = oParent;
    function toString(bDingbat) {
        var sDingbat = bDingbat ? mcDropDown.dingbatOff : mcDropDown.spacerGif;
        var iEdgePadding = mcDropDown.itemPadding + mcDropDown.menuPadding;
        var sPaddingLeft = "padding:" + mcDropDown.itemPadding + "px; padding-left:" + iEdgePadding + "px;"
        var sPaddingRight = "padding:" + mcDropDown.itemPadding + "px; padding-right:" + iEdgePadding + "px;"
        return '<tr class="item"><td nowrap style="' + sPaddingLeft + '">' + sText + '</td><td width="14" style="' + sPaddingRight + '">' + '<img src="' + sDingbat + '" width="14" height="14"></td></tr>';
    }
}

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();
}


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);
}

Accelimation.prototype.stop = function() 
{
    Accelimation._remove(this);
}




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();
}

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




Accelimation._add = function(o) {
var index = this.instances.length;
this.instances[index] = o;

if (this.instances.length == 1) {
this.timerID = window.setInterval("Accelimation._paintAll()", this.targetRes);
}
}

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 (this.instances.length == 0) {
window.clearInterval(this.timerID);
this.timerID = null;
}
}

Accelimation._paintAll = function() 
{
    var now = new Date().getTime();
    for (var i = 0; i < this.instances.length; i++) {
        this.instances[i]._paint(now);
    }
}

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) }

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);
}



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