var MainID = -1;
var host = document.location.host;
var page = document.location.href.substring(document.location.href.indexOf(host)+host.length);
page = page.toLowerCase();

var AD = new Array();
AD.push({image: "/ad/0.jpg", url: "/contact.htm"});
AD.push({image: "/ad/1.jpg", url: "/events.htm"});
AD.push({image: "/ad/2.jpg", url: "/events.htm"});
AD.push({image: "/ad/3.jpg", url: "/knowledge.htm"});

function compare(arg1,arg2){
	return arg1[1]-arg2[1];
}
function ShowAD(num){
	var N = AD.length;
	var RN = new Array();
	var total = 0;
	
	for (i = 0; i < N; i++) RN[i] = [i,Math.random()];
	RN.sort(compare);
	for (i = 0; i < N; i++) {
		//document.write("<td><img src=\"gallery/"+Gallery[RN[i][0]]["image"]+"\"></td><td>&nbsp;&nbsp;&nbsp;</td>");
		if (page != AD[RN[i][0]]["url"]) {
			document.write("<a href=\""+AD[RN[i][0]]["url"]+"\"><img src=\""+AD[RN[i][0]]["image"]+"\"/></a><br><br>");
			total++;
			if (total>=num) break;
		}
	}
}

var Cat = new Array();
Cat.push({img: ""});
Cat.push({img: "tab_about.jpg"});
Cat.push({img: ""});
Cat.push({img: "tab_news.jpg"});
Cat.push({img: ""});
Cat.push({img: "tab_knowledge.jpg"});
Cat.push({img: "tab_events.jpg"});
Cat.push({img: "tab_alumni.jpg"});
Cat.push({img: ""});
Cat.push({img: ""});
Cat.push({img: ""});

function getMenuId(menuid) {
	return "cat_" + menuid;
}

function hardSetSelectedItem(menuid,pageurl) {
	menuid = getMenuId(menuid);
	pageurl = pageurl.toLowerCase();
	if (pageurl == page) return;
	var ie = 0;
	var detect = navigator.userAgent.toLowerCase();	
	if (detect.indexOf('msie') > 0) ie = 1;
	var menus = document.getElementById(menuid);
	if (menus == null) return;
	var tds = menus.getElementsByTagName("td");
	setSelected(tds, pageurl, ie);
}

function getMenuItem(menuid) {
	menuid = getMenuId(menuid);
	var menus = document.getElementById(menuid);
	if (menus == null) return;
	var tds = menus.getElementsByTagName("td");
	for (var i = 0; i < tds.length; i++) {
		var mouseover = tds[i].onmouseover;
		if (mouseover == null) return i;
	}
	return -1;
}

function getMenu(menuid) {
	menuid = getMenuId(menuid);
	var menus = document.getElementById(menuid);
	if (menus == null) return false;
	var tds = menus.getElementsByTagName("td");
	for (var i = 0; i < tds.length; i++) {
		if (tds[i].getAttribute("onclick") != null)	{
			itemurl = tds[i].getAttribute("onclick").toString();
			pos = itemurl.indexOf("=");
			if (pos != -1) {
				pos2 = itemurl.indexOf(';');
				itemurl = itemurl.substring(pos+2,pos2-1);
				if (itemurl.toLowerCase() == page.toLowerCase()) return true;
			}
		}
	}
	return false;
}

function getMainID(){
	if (getMenu("155028")) {
		hardSetSelectedItem("154993","/about.htm"); //top menu
		MainID=1;
		return;
	}
	if (getMenu("155030")) {
		hardSetSelectedItem("154993","/news.htm"); //top menu
		MainID=3;
		return;
	}
	if (getMenu("155031")) {
		hardSetSelectedItem("154993","/knowledge.htm"); //top menu
		MainID=5;
		return;
	}
	if (getMenu("155032")) {
		hardSetSelectedItem("154993","/events.htm"); //top menu
		MainID=6;
		return;
	}
	if (getMenu("155033")) {
		hardSetSelectedItem("154993","/alumni.htm"); //top menu
		MainID=7;
		return;
	}
}

function getMain() {
	MainID=getMenuItem("154993");
	if (MainID == -1) getMainID();
	if (MainID == 1 || MainID == 3 || MainID == 5 || MainID == 6 || MainID == 7) {
		document.getElementById("menutable").style.display="inline";
		document.getElementById("headercontent").src="/images/"+Cat[MainID]["img"];
		document.getElementById("sub"+MainID).style.display="inline";
	}
	//alert(page.substring(1,6));
	if (page.substring(1,6).toLowerCase() == "forum") hardSetSelectedItem("247509","/forum.htm");
}