function expandContract(item_id){
	var controller = document.getElementById(item_id+'-control');
	var list_item = document.getElementById(item_id+'-menu');
	if(list_item.className == 'contractable') {
			list_item.className = 'expandable';
			controller.className = 'expand';
	}
	else {
			list_item.className = 'contractable';
			controller.className = 'contract';
	}
}
sfHover = function() {
	var sfEls = document.getElementById("main_nav").getElementsByTagName("li");
	for (var i=0; i<sfEls.length; i++) {
		sfEls[i].onmouseover=function() {
			this.className+=" sfhover";
		}
		sfEls[i].onmouseout=function() {
			this.className=this.className.replace(new RegExp(" sfhover\\b"), "");
		}
	}
}
if (window.attachEvent) window.attachEvent("onload", sfHover);