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) {
		top_01_over = newImage("images/top_01-over.gif");
		top_05_over = newImage("images/top_05-over.gif");
		top_06_over = newImage("images/top_06-over.gif");
		top_06_top_07_over = newImage("images/top_06-top_07_over.gif");
		top_07_over = newImage("images/top_07-over.gif");
		top_08_over = newImage("images/top_08-over.gif");
		top_09_over = newImage("images/top_09-over.gif");
		top_10_over = newImage("images/top_10-over.gif");
		top_12_top_15_over = newImage("images/top_12-top_15_over.gif");
		top_14_top_15_over = newImage("images/top_14-top_15_over.gif");
		top_14_over = newImage("images/top_14-over.gif");
		top_14_top_15_down = newImage("images/top_14-top_15_down.gif");
		top_15_down = newImage("images/top_15-down.gif");
		Bottom_17_over = newImage("images/Bottom_17-over.gif");
		preloadFlag = true;
	}
}
preloadImages();