function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
	if (document.images) {
		verizon_sprint_over = newImage("images/verizon-sprint_over.gif");
		verizon_over = newImage("images/verizon-over.gif");
		sprint_over = newImage("images/sprint-over.gif");
		nextel_over = newImage("images/nextel-over.gif");
		cingular_over = newImage("images/cingular-over.gif");
		alltel_over = newImage("images/alltel-over.gif");
		boost_over = newImage("images/boost-over.gif");
		tmobile_over = newImage("images/tmobile-over.gif");
		celluarone_over = newImage("images/celluarone-over.gif");
		celluarone_other_over = newImage("images/celluarone-other_over.gif");
		dobson_over = newImage("images/dobson-over.gif");
		other_over = newImage("images/other-over.gif");
		preloadFlag = true;
	}
}