var ie5 = document.all;
var ns6 = document.getElementById&&!document.all;

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

function showhide(obj, e, visible, hidden) {
    if (ie5 || ns6)
	dropmenuobj.style.left = dropmenuobj.style.top = -1000;
    if (e.type == "click" && obj.visibility == hidden || e.type == "mouseover")
	obj.visibility = visible;
    else if (e.type == "click")
	obj.visibility = hidden;
}

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

function clearbrowseredge(obj, whichedge) {
    var edgeoffset = 0;
    if (whichedge == "rightedge") {
	var windowedge = (ie5 && !window.opera) ?
	    iecompattest().scrollLeft + iecompattest().clientWidth - 15 :
	    window.pageXOffset + window.innerWidth - 15;
	dropmenuobj.contentmeasure = dropmenuobj.offsetWidth;
	if ((windowedge-dropmenuobj.x) < dropmenuobj.contentmeasure)
	    edgeoffset = dropmenuobj.contentmeasure - obj.offsetWidth;
    } else {
	var topedge = (ie5 && !window.opera) ?
	    iecompattest().scrollTop :
	    window.pageYOffset;
	var windowedge = (ie5 && !window.opera) ?
	    iecompattest().scrollTop + iecompattest().clientHeight - 15 :
	    window.pageYOffset + window.innerHeight - 18;
	dropmenuobj.contentmeasure = dropmenuobj.offsetHeight;
	if (windowedge-dropmenuobj.y < dropmenuobj.contentmeasure) {
	    edgeoffset = dropmenuobj.contentmeasure + obj.offsetHeight;
	    if ((dropmenuobj.y-topedge) < dropmenuobj.contentmeasure) {
		edgeoffset = dropmenuobj.y + obj.offsetHeight - topedge;
	    }
	}
    }
    return edgeoffset;
}

function removemenu() {
    if (typeof dropmenuobj != "undefined") {
	dropmenuobj.style.visibility = "hidden";
	dropmenuobj.style.left = dropmenuobj.style.top = -1000;
    }
    return true;
}

function dropdownmenu(obj, e, dropmenuid) {
    if (window.event)
	event.cancelBubble = true;
    else if (e.stopPropagation)
	e.stopPropagation();
    if (typeof dropmenuobj != "undefined") {
	dropmenuobj.style.visibility = "hidden";
	dropmenuobj.style.left = dropmenuobj.style.top = -1000;
    }
    clearhidemenu();
    if (ie5 || ns6) {
	obj.onmouseout = delayhidemenu;
	dropmenuobj = document.getElementById(dropmenuid);
	dropmenuobj.onclick = function() {
	    dropmenuobj.style.visibility = 'hidden';
	    dropmenuobj.style.left = dropmenuobj.style.top = -1000;
	}
	dropmenuobj.onmouseover = clearhidemenu;
	dropmenuobj.onmouseout = ie5 ?
	    function() { dynamichide(event) } :
	    function(event) { dynamichide(event) }
	showhide(dropmenuobj.style, e, "visible", "hidden");
	dropmenuobj.x = getposOffset(obj, "left");
	dropmenuobj.y = getposOffset(obj, "top");
	dropmenuobj.style.left = dropmenuobj.x-clearbrowseredge(obj, "rightedge")+"px";
	dropmenuobj.style.top = dropmenuobj.y-clearbrowseredge(obj, "bottomedge")+obj.offsetHeight+"px";
    }
    return true;
}

function contains_ns6(a, b) {
    while (b.parentNode)
	if ((b = b.parentNode) == a)
	    return true;
    return false;
}

function dynamichide(e) {
    if (ie5 && !dropmenuobj.contains(e.toElement))
	delayhidemenu();
    else if (ns6 && e.currentTarget != e.relatedTarget && !contains_ns6(e.currentTarget, e.relatedTarget))
	delayhidemenu();
}

function delayhidemenu() {
    delayhide = setTimeout("dropmenuobj.style.visibility='hidden'; dropmenuobj.style.left = dropmenuobj.style.top = -1000;", 250);
}

function clearhidemenu() {
    if (typeof delayhide != "undefined")
	clearTimeout(delayhide);
}