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("/img/menu/nav_home-over.gif");
		nav_users_over = newImage("/img/menu/nav_users-over.gif");
		nav_file_over = newImage("/img/menu/nav_file-over.gif");
		nav_playlist_over = newImage("/img/menu/nav_playlist-over.gif");
		nav_client_over = newImage("img/menu/nav_client-over.gif");
		nav_plugin_over = newImage("/img/menu/nav_plugin-over.gif");
		nav_help_over = newImage("img/menu/nav_help-over.gif");
		preloadFlag = true;
	}
}