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) {
	   button_ae1 = newImage("images/button_ae1.gif");
		button_aof1 = newImage("images/button_aof1.gif");
		button_wsa1 = newImage("images/button_wsa1.gif");
		button_fdo1 = newImage("images/button_fdo1.gif");
		button_p1 = newImage("images/button_p1.gif");
		button_os1 = newImage("images/button_os1.gif");
		button_cu1 = newImage("images/button_cu1.gif");
                button_ss1 = newImage("images/button_ss1.gif");		
								preloadFlag = true;
	}
}