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) {
		left_02_over = newImage("images/left_02-over.gif");
		left_06_over = newImage("images/left_06-over.gif");
		left_06_down = newImage("images/left_06-down.gif");
		left_09_over = newImage("images/left_09-over.gif");
		left_09_down = newImage("images/left_09-down.gif");
		left_11_over = newImage("images/left_11-over.gif");
		left_11_down = newImage("images/left_11-down.gif");
		left_13_over = newImage("images/left_13-over.gif");
		left_13_down = newImage("images/left_13-down.gif");
		left_15_over = newImage("images/left_15-over.gif");
		left_15_down = newImage("images/left_15-down.gif");
		left_17_over = newImage("images/left_17-over.gif");
		left_17_down = newImage("images/left_17-down.gif");
		left_19_over = newImage("images/left_19-over.gif");
		left_19_down = newImage("images/left_19-down.gif");
		left_21_over = newImage("images/left_21-over.gif");
		left_21_down = newImage("images/left_21-down.gif");
		left_23_over = newImage("images/left_23-over.gif");
		left_23_down = newImage("images/left_23-down.gif");
		top_04_over = newImage("images/top_04-over.gif");
		top_06_over = newImage("images/top_06-over.gif");
		top_10_over = newImage("images/top_10-over.gif");
		top_12_over = newImage("images/top_12-over.gif");
		top_14_over = newImage("images/top_14-over.gif");
		preloadFlag = true;
	}
}