cambiaHeader = function (){
cur=Math.round(8*Math.random()+1);
	main = document.getElementById("main");
	main.style.backgroundImage = "url(Headers/Header0" + cur + ".jpg)";
clearTimeout(cuenta);
headerTimer();
}
headerTimer = function(){
	cuenta = setTimeout(cambiaHeader, 10000);
}

startList = function() {
	if (document.all&&document.getElementById) {
		navRoot = document.getElementById("leftnav");
		for (i=0; i<navRoot.childNodes.length; i++) {
			node = navRoot.childNodes[i];
			if (node.nodeName=="LI") {
				node.onmouseover=function() {
					this.className+=" over";
				}
				node.onmouseout=function() {
					this.className=this.className.replace(" over", "");
				}
			}
		}
	}
}
window.onload=startList;// JavaScript Document