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) {
		welcome_over = newImage("images/welcome-over.gif");
		MeetUs_over = newImage("images/MeetUs-over.gif");
		PatientInformation_over = newImage("images/PatientInformation-over.gif");
		Periodontal_Disease_over = newImage("images/Periodontal-Disease-over.gif");
		Consequences_over = newImage("images/Consequences-over.gif");
		Procedures_over = newImage("images/Procedures-over.gif");
		Frequently_Asked_Questions_over = newImage("images/Frequently-Asked-Questions-.gif");
		Resources_over = newImage("images/Resources-over.gif");
		Contact_over = newImage("images/Contact-over.gif");
		preloadFlag = true;
	}
}