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) {
		nav_home_over = newImage("images/nav_home_over.html");
		nav_overview_over = newImage("images/nav_overview_over.html");
		nav_availability_over = newImage('mages/nav_availability_over.html');
		nav_amenities_over = newImage('images/nav_amenities_over.html');
		nav_tenant_login_over = newImage('images/nav_tenant_login_over.html');
		nav_broker_toolbox_over = newImage('images/nav_broker_toolbox_over.html');
		nav_contact_us_over = newImage('images/nav_contact_us_over.html');
		nav_feedback_over = newImage('images/feedback_btnR.jpg');
		
		preloadFlag = true;
	}
}