function activateA(cur) {
	var t = cur;
	if (t) {
		t=t.firstChild;
		if (t) {
			var pos = t.className.indexOf('nav_item_level_1');
			if (pos>=0) { t.className += ' hoveratag'; }
		}
	}
}

function deActivateA(cur) {
	var t = cur;
	if (t) {
		t=t.firstChild;
		if (t) {
			var pos = t.className.indexOf('nav_item_level_1');
			if (pos>=0) { t.className=t.className.replace(" hoveratag", ""); }
		}
	}
}


activateMenu = function(nav) {
	var navroot = document.getElementById(nav);
	var lis=navroot.getElementsByTagName("LI");  
	for (i=0; i<lis.length; i++) {
		if(lis[i].lastChild.tagName=="UL"){
			lis[i].onmouseover=function() {	
				this.lastChild.style.display="block";
				activateA(this);
			}
			lis[i].onmouseout=function() {                       
				this.lastChild.style.display="none";
				deActivateA(this);
			}
		}
	}
}

window.onload= function(){
	activateMenu('nav_menu'); 
}