function alphabetActive() {
	$$('.alphabet-index li a').each(function(node,index) {
		node.onmouseover = function(nd,num) {
			var targetNode = this.parentNode;
			Element.addClassName(targetNode,'on');
		}
		node.onmouseout = function() {
			var targetNode = this.parentNode;
			Element.removeClassName(targetNode,'on');
		}
	});
}
Event.observe(window,'load',alphabetActive,false);