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) {
		b1_over = newImage("img/b1-over.gif");
		b1_down = newImage("img/b1-down.gif");
		b2_over = newImage("img/b2-over.gif");
		b2_down = newImage("img/b2-down.gif");
		b3_over = newImage("img/b3-over.gif");
		b3_down = newImage("img/b3-down.gif");
		b4_over = newImage("img/b4-over.gif");
		b4_down = newImage("img/b4-down.gif");
		b5_over = newImage("img/b5-over.gif");
		b5_down = newImage("img/b5-down.gif");
		b6_over = newImage("img/b6-over.gif");
		b6_down = newImage("img/b6-down.gif");
		b7_over = newImage("img/b7-over.gif");
		b7_down = newImage("img/b7-down.gif");
		b8_over = newImage("img/b8-over.gif");
		b8_down = newImage("img/b8-down.gif");
		b1_over = newImage("img/b1n-over.gif");
		b1_down = newImage("img/b1n-down.gif");
		b2_over = newImage("img/b2n-over.gif");
		b2_down = newImage("img/b2n-down.gif");
		b3_over = newImage("img/b3n-over.gif");
		b3_down = newImage("img/b3n-down.gif");
		b4_over = newImage("img/b4n-over.gif");
		b4_down = newImage("img/b4n-down.gif");
		b5_over = newImage("img/b5n-over.gif");
		b5_down = newImage("img/b5n-down.gif");
		b6_over = newImage("img/b6n-over.gif");
		b6_down = newImage("img/b6n-down.gif");
		b7_over = newImage("img/b7n-over.gif");
		b7_down = newImage("img/b7n-down.gif");
		b8_over = newImage("img/b8n-over.gif");
		b8_down = newImage("img/b8n-down.gif");
		
		buy_over = newImage("img/buy-over.gif");
		buy_down = newImage("img/buy-down.gif");
		
		toku_over = newImage("img/toku-over.gif");
		toku_down = newImage("img/toku-down.gif");
		
		header2 = newImage("img/header2.gif");
		bg_aya = newImage("img/bg_aya.gif");
		footer = newImage("img/footer.gif");
		
		preloadFlag = true;
	}
}