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) {
		home_over = newImage("/_system/travelsmartuk/images/home-over.gif");
		bus_over = newImage("/_system/travelsmartuk/images/bus-over.gif");
		car_sharing_over = newImage("/_system/travelsmartuk/images/car-sharing-over.gif");
		car_over = newImage("/_system/travelsmartuk/images/car-over.gif");
		cycling_over = newImage("/_system/travelsmartuk/images/cycling-over.gif");
		cycleroutes_over = newImage("/_system/travelsmartuk/images/cycleroutes-over.gif");
		walking_over = newImage("/_system/travelsmartuk/images/walking-over.gif");
		airports_over = newImage("/_system/travelsmartuk/images/airports-over.gif");
		trains_over = newImage("/_system/travelsmartuk/images/trains-over.gif");
		comparator_over = newImage("/_system/travelsmartuk/images/comparator-over.gif");
		preloadFlag = true;
	}
}