function inicializar_menu(){
    var items = document.getElementsByTagName("li");
    for(var i = 0; i < items.length; i++){
    	if(items[i].className == "subcategoria"){
		    items[i].onmouseover = function(){
		    	this.style.height = "38px";
		    	this.style.backgroundColor = "#F2F2F2";
				var div_item = this.getElementsByTagName("div");
				div_item[0].style.display = "";
		    };
		    items[i].onmouseout = function(){
		    	this.style.height = "";
		    	this.style.backgroundColor = "";
				var div_item = this.getElementsByTagName("div");
				div_item[0].style.display = "none";
		    };
		}
    }
}
addLoadEvent(inicializar_menu);