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) {
		btn_tim_over = newImage("images/btn_tim-over.jpg");
		btn_fumico_over = newImage("images/btn_fumico-over.jpg");
		btn_zuzushii_over = newImage("images/btn_zuzushii-over.jpg");
		preloadFlag = true;
	}
}

function openWin(URL)
{
aWindow=window.open(URL,"Portfolio","toolbar=no,width=780,height=680,status=no,scrollbars=yes,resize=yes,menubar=no,history=no");
}