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) {
		var main_home = newImage("/site_images/nav/main_home_on.gif");
		var main_store = newImage("/site_images/nav/main_store_on.gif");
		var main_dpvm = newImage("/site_images/nav/main_dpvm_on.gif");
		var main_about = newImage("/site_images/nav/main_about_on.gif");
		var store_home = newImage("/site_images/nav/store_home_on.gif");
		var store_store = newImage("/site_images/nav/store_store_on.gif");
		var store_dpvm = newImage("/site_images/nav/store_dpvm_on.gif");
		var store_about = newImage("/site_images/nav/store_about_on.gif");
		preloadFlag = true;
	}
}