function load_images() {
	var ii = new Image();
	ii.src = "images/main/buttons/home_on.gif";
	ii.src = "images/main/buttons/about_on.gif";
	ii.src = "images/main/buttons/services_on.gif";
	ii.src = "images/main/buttons/faq_on.gif";
	ii.src = "images/main/buttons/contact_on.gif";
} // end preload_images

function swap(obj, newImg) {
	obj.src = "images/main/buttons/"+newImg+".gif";
} // end swap