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) {
		left_menu_03_over = newImage("images/left_menu_03-over.gif");
		left_menu_04_over = newImage("images/left_menu_04-over.gif");
		left_menu_07_over = newImage("images/left_menu_07-over.gif");
		left_menu_08_over = newImage("images/left_menu_08-over.gif");
		left_menu_10_over = newImage("images/left_menu_10-over.gif");
		menu_top_07_over = newImage("images/menu_top_07-over.jpg");
		menu_top_09_over = newImage("images/menu_top_09-over.jpg");
		menu_top_15_over = newImage("images/menu_top_15-over.jpg");
		menu_top_17_over = newImage("images/menu_top_17-over.jpg");
		menu_top_20_over = newImage("images/menu_top_20-over.jpg");
		preloadFlag = true;
	}
}