//Chrome Drop Down Menu v2.01- Author: Dynamic Drive (http://www.dynamicdrive.com)
//Last updated: November 14th 06- added iframe shim technique

var cssdropdown={
    disappeardelay: 250, //set delay in miliseconds before menu disappears onmouseout
    disablemenuclick: true, //when user clicks on a menu item with a drop down menu, disable menu item's link?
    enableswipe: 1, //enable swipe effect? 1 for yes, 0 for no
    enableiframeshim: 1, //enable "iframe shim" technique to get drop down menus to correctly appear on top of controls such as form objects in IE5.5/IE6? 1 for yes, 0 for no

    //No need to edit beyond here////////////////////////
    dropmenuobj: null, ie: document.all, firefox: document.getElementById&&!document.all, swipetimer: undefined, bottomclip:0,

getposOffset:function(what, offsettype)
{
    var totaloffset=(offsettype=="left")? what.offsetLeft : what.offsetTop;
    var parentEl=what.offsetParent;
    while (parentEl!=null)
    {
        totaloffset=(offsettype=="left")? totaloffset+parentEl.offsetLeft : totaloffset+parentEl.offsetTop;
        parentEl=parentEl.offsetParent;
    }
    return totaloffset;
},

swipeeffect:function()
{
    if (this.bottomclip<parseInt(this.dropmenuobj.offsetHeight))
    {
        this.bottomclip+=10+(this.bottomclip/10); //unclip drop down menu visibility gradually
        this.dropmenuobj.style.clip="rect(0 auto "+this.bottomclip+"px 0)";
    }
    else
        return;
    this.swipetimer=setTimeout("cssdropdown.swipeeffect()", 10);
},

showhide:function(obj, e)
{
    if (this.ie || this.firefox)
        this.dropmenuobj.style.left=this.dropmenuobj.style.top="-500px";
    if (e.type=="click" && obj.visibility==hidden || e.type=="mouseover")
    {
        if (this.enableswipe==1)
        {
            if (typeof this.swipetimer!="undefined")
                clearTimeout(this.swipetimer);
            obj.clip="rect(0 auto 0 0)"; //hide menu via clipping
            this.bottomclip=0;
            this.swipeeffect();
        }
        obj.visibility="visible";
    }
    else if (e.type=="click")
        obj.visibility="hidden";
},

iecompattest:function()
{
    return (document.compatMode && document.compatMode!="BackCompat")? document.documentElement : document.body;
},

clearbrowseredge:function(obj, whichedge)
{
    var edgeoffset=0;
    if (whichedge=="rightedge")
    {
        var windowedge=this.ie && !window.opera? this.iecompattest().scrollLeft+this.iecompattest().clientWidth-15 : window.pageXOffset+window.innerWidth-15;
        this.dropmenuobj.contentmeasure=this.dropmenuobj.offsetWidth;
        if (windowedge-this.dropmenuobj.x < this.dropmenuobj.contentmeasure)  //move menu to the left?
            edgeoffset=this.dropmenuobj.contentmeasure-obj.offsetWidth;
    }
    else
    {
        var topedge=this.ie && !window.opera? this.iecompattest().scrollTop : window.pageYOffset;
        var windowedge=this.ie && !window.opera? this.iecompattest().scrollTop+this.iecompattest().clientHeight-15 : window.pageYOffset+window.innerHeight-18;
        this.dropmenuobj.contentmeasure=this.dropmenuobj.offsetHeight;
        if (windowedge-this.dropmenuobj.y < this.dropmenuobj.contentmeasure)
        { //move up?
            edgeoffset=this.dropmenuobj.contentmeasure+obj.offsetHeight;
            if ((this.dropmenuobj.y-topedge)<this.dropmenuobj.contentmeasure) //up no good either?
                edgeoffset=this.dropmenuobj.y+obj.offsetHeight-topedge;
        }
    }
    return edgeoffset;
},

dropit:function(obj, e, dropmenuID)
{
    if (this.dropmenuobj!=null) //hide previous menu
        this.dropmenuobj.style.visibility="hidden"; //hide menu
    this.clearhidemenu();
    if (this.ie||this.firefox)
    {
        obj.onmouseout=function(){cssdropdown.delayhidemenu();}
        obj.onclick=function()
            {return !cssdropdown.disablemenuclick;} 
        //disable main menu item link onclick?
        this.dropmenuobj=document.getElementById(dropmenuID);
        this.dropmenuobj.onmouseover=function()
            {cssdropdown.clearhidemenu();}
        this.dropmenuobj.onmouseout=function(e)
            {cssdropdown.dynamichide(e);}
        this.dropmenuobj.onclick=function()
            {cssdropdown.delayhidemenu();}
        this.showhide(this.dropmenuobj.style, e);
        this.dropmenuobj.x=this.getposOffset(obj, "left");
        this.dropmenuobj.y=this.getposOffset(obj, "top");
        this.dropmenuobj.style.left=this.dropmenuobj.x-this.clearbrowseredge(obj, "rightedge")+"px";
        this.dropmenuobj.style.top=this.dropmenuobj.y-this.clearbrowseredge(obj, "bottomedge")+obj.offsetHeight+1+"px";
        this.positionshim(); //call iframe shim function
    }
},

positionshim:function()
{ //display iframe shim function
    if (this.enableiframeshim && typeof this.shimobject!="undefined")
    {
        if (this.dropmenuobj.style.visibility=="visible")
        {
            this.shimobject.style.width=this.dropmenuobj.offsetWidth+"px";
            this.shimobject.style.height=this.dropmenuobj.offsetHeight+"px";
            this.shimobject.style.left=this.dropmenuobj.style.left;
            this.shimobject.style.top=this.dropmenuobj.style.top;
        }
        this.shimobject.style.display=(this.dropmenuobj.style.visibility=="visible")? "block" : "none";
    }
},

hideshim:function()
{
    if (this.enableiframeshim && typeof this.shimobject!="undefined")
        this.shimobject.style.display='none';
},

contains_firefox:function(a, b) 
{
    while (b.parentNode)
    if ((b = b.parentNode) == a)
        return true;
    return false;
},

dynamichide:function(e)
{
    var evtobj=window.event? window.event : e;
    if (this.ie&&!this.dropmenuobj.contains(evtobj.toElement))
        this.delayhidemenu();
    else if (this.firefox&&e.currentTarget!= evtobj.relatedTarget&& !this.contains_firefox(evtobj.currentTarget, evtobj.relatedTarget))
        this.delayhidemenu();
},

delayhidemenu:function(){
this.delayhide=setTimeout("cssdropdown.dropmenuobj.style.visibility='hidden'; cssdropdown.hideshim()",this.disappeardelay); //hide menu
},

clearhidemenu:function(){
if (this.delayhide!="undefined")
clearTimeout(this.delayhide);
},

startchrome:function()
{
    for (var ids=0; ids<arguments.length; ids++)
    {
        var menuitems=document.getElementById(arguments[ids]).getElementsByTagName("a");
        for (var i=0; i<menuitems.length; i++)
        {
            if (menuitems[i].getAttribute("rel"))
            {
                var relvalue=menuitems[i].getAttribute("rel");
                menuitems[i].onmouseover=function(e)
                {
                    var event=typeof e!="undefined"? e : window.event;
                    cssdropdown.dropit(this,event,this.getAttribute("rel"));
                }
            }
        }
    }
    if (window.createPopup && !window.XmlHttpRequest){ //if IE5.5 to IE6, create iframe for iframe shim technique
    document.write('<IFRAME id="iframeshim"  src="" style="display: none; left: 0; top: 0; z-index: 90; position: absolute; filter: progid:DXImageTransform.Microsoft.Alpha(style=0,opacity=0)" frameBorder="0" scrolling="no"></IFRAME>');
    this.shimobject=document.getElementById("iframeshim"); //reference iframe object
    }
}

}