function setClass(over, where){
	var hoverStr = 'hover';
	if (over){
		where.className = hoverStr;
	} else {
		where.className = '';
	}
}

function adaptLis(){
	var lis = "";
	lis = document.getElementById('main-nav').getElementsByTagName('li');
	if (lis != "" && lis != undefined && lis != null){
		for (i = 0; i < lis.length; i++){
			li = lis[i];
			li.onmouseover = function(){
				setClass(true, this);
			}
			li.onmouseout = function(){
				setClass(false, this);
			}
		}
	}
}