startList = function() {
					if (document.all&&document.getElementById) { // Solo si es IE6
						navRoot = document.getElementById("menuPrincipal");
						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;