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) {
		contact_over = newImage("images/contact-over.jpg");
		home_over = newImage("images/home-over.jpg");
		login_over = newImage("images/login-over.jpg");
		doctor_over = newImage("images/doctor-over.jpg");
		team_over = newImage("images/team-over.jpg");
		tour_over = newImage("images/tour-over.jpg");
		visit_over = newImage("images/visit-over.jpg");
		ortho_over = newImage("images/ortho-over.jpg");
		braces_over = newImage("images/braces-over.jpg");
		invisalign_over = newImage("images/invisalign-over.jpg");
		suresmile_over = newImage("images/suresmile-over.jpg");
		game_over = newImage("images/game-over.jpg");
		for_children_over = newImage("images/for-children-over.jpg");
		for_adults_over = newImage("images/for-adults-over.jpg");
		magic_braces_over = newImage("images/magic-braces-over.jpg");
		resources_over = newImage("images/resources-over.jpg");
		comment_form_over = newImage("images/comment-form-over.jpg");
		patient_form_over = newImage("images/patient-form-over.jpg");
		doc_form_over = newImage("images/doc-form-over.jpg");
		preloadFlag = true;
	}
}