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) {
		home1 = newImage("images/home.jpg");
		home2 = newImage("images/home_selected.jpg");
		aboutus1 = newImage("images/aboutus.jpg");
		aboutus2 = newImage("images/aboutus_selected.jpg");
		benefits1 = newImage("images/benefits.jpg");
		benefits2 = newImage("images/benefits_selected.jpg");
		samples_over1 = newImage("images/samples.jpg");
		samples_over2 = newImage("images/samples_selected.jpg");
		contactus_over1 = newImage("images/contactus.jpg");
		contactus_over2 = newImage("images/contactus_selected.jpg");
		preloadFlag = true;
	}
}