function listEven() {
	contArb = document.getElementById("comentarios");
	contLists = contArb.getElementsByTagName("UL");
	for (i=0; i<contLists.length; i++) {
		contElems = contLists[i].getElementsByTagName("LI");
		contElems[0].className="first";
		even = true;
		for (j=0; j<contElems.length; j++) {
			even = !even;
			if(even) contElems[j].className="even";
		}
	}
}