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) {
		weathermap_03_over = newImage("images/weathermap_03-over.gif");
		weathermap_07_over = newImage("images/weathermap_07-over.gif");
		weathermap_10_over = newImage("images/weathermap_10-over.gif");
		weathermap_15_over = newImage("images/weathermap_15-over.gif");
		weathermap_17_over = newImage("images/weathermap_17-over.gif");
		weathermap_21_over = newImage("images/weathermap_21-over.gif");
		weathermap_24_over = newImage("images/weathermap_24-over.gif");
		weathermap_26_over = newImage("images/weathermap_26-over.gif");
		weathermap_29_over = newImage("images/weathermap_29-over.gif");
		weathermap_33_over = newImage("images/weathermap_33-over.gif");
		weathermap_37_over = newImage("images/weathermap_37-over.gif");
		preloadFlag = true;
	}
}
preloadImages();