// JavaScript Document

function expandContent (linkobj) {
	document.getElementById (linkobj.getAttribute ("rel")).style.display = "block";
}

function initializeTabs () {
	for (var i=0; i < arguments.length; i++) {
		var ulobj = document.getElementById (arguments[i]);
		var ulist = ulobj.getElementsByTagName ("li");
		
		expandContent (ulist[0].getElementsByTagName ("a")[0]);
	}	
}

function changeTabClass (tablist, tab) {
	var tabListObj = document.getElementById (tablist).getElementsByTagName ("li");
	var tabObj = document.getElementById (tab);
	for (var i = 0; i < tabListObj.length; i++) {
		tabListObj [i].className = "";
	}
	
	tabObj.className = "selected";	
	
	for (var i=0; i < tabListObj.length; i++) {
		var divListObj = tabListObj[i].getElementsByTagName ("a");
		
		for (var j=0; j < divListObj.length; j++) {
			document.getElementById (divListObj[j].getAttribute ("rel")).style.display = "none";
		}
	}
	
	expandContent (document.getElementById (tab).getElementsByTagName ("a")[0]);
}

function showPrinciples (arg) {
	document.getElementById ('prin').style.display = "none";
	document.getElementById ('tim').style.display = "none";
	document.getElementById (arg).style.display = "block";
}