jQuery.preloadImages = function(){
	for(var i = 0; i<arguments.length; i++) {
		jQuery("<img>").attr("src", arguments[i]);
	}
}

$.preloadImages("images/home_services_normal.jpg",
				"images/sub_service1_hover.jpg", "images/sub_service1_hover2.jpg",
				"images/sub_service2_hover.jpg", "images/sub_service2_hover2.jpg",
				"images/sub_service3_hover.jpg", "images/sub_service3_hover2.jpg",
				"images/sub_service4_hover.jpg", "images/sub_service4_hover2.jpg",
				"images/sub_service5_hover.jpg", "images/sub_service5_hover2.jpg",
				"images/sub_service6_hover.jpg", "images/sub_service6_hover2.jpg",
				"images/sub_service7_hover.jpg", "images/sub_service7_hover2.jpg",
				"images/sub_service8_hover.jpg");

$(function(){
	$("#services li").hover(
		function(){
			$("#services").addClass($(this).attr("id")+"-hover");
		},
		function(){
			$("#services").removeClass($(this).attr("id")+"-hover");
		}
	);
});