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) {
		
		id01_over = newImage("images/menu/top_01_a.gif");
		id02_over = newImage("images/menu/top_02_a.gif");
		id03_over = newImage("images/menu/top_03_a.gif");
		id04_over = newImage("images/menu/top_04_a.gif");
		id05_over = newImage("images/menu/top_06_a.gif");
		id06_over = newImage("images/menu/top_06_a.gif");
		id07_over = newImage("images/menu/top_07_a.gif");
		id08_over = newImage("images/menu/top_08_a.gif");
		id09_over = newImage("images/menu/top_09_a.gif");
		
		id10_over = newImage("images/menu/bottom_01_a.gif");
		id11_over = newImage("images/menu/bottom_02_a.gif");
		id12_over = newImage("images/menu/bottom_03_a.gif");
		id13_over = newImage("images/menu/bottom_04_a.gif");
		id14_over = newImage("images/menu/bottom_05_a.gif");
		
		id21_over = newImage("images/menu/top_21_a.gif");
		id22_over = newImage("images/menu/top_22_a.gif");
		id23_over = newImage("images/menu/top_23_a.gif");
		id24_over = newImage("images/menu/top_24_a.gif");
		id25_over = newImage("images/menu/top_25_a.gif");
		id26_over = newImage("images/menu/top_26_a.gif");
		id27_over = newImage("images/menu/top_27_a.gif");
		id28_over = newImage("images/menu/top_28_a.gif");
		id29_over = newImage("images/menu/top_29_a.gif");


		preloadFlag = true;
	}
}