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) {
		topbt_01_over = newImage("images/topbt_01-over.gif");
		topbt_01_topbt_02_over = newImage("images/topbt_01.gif");
		topbt_02_topbt_01_over = newImage("images/topbt_02.gif");
		topbt_02_over = newImage("images/topbt_02-over.gif");
		topbt_02_topbt_03_over = newImage("images/topbt_02.gif");
		topbt_03_topbt_02_over = newImage("images/topbt_03.gif");
		topbt_03_over = newImage("images/topbt_03-over.gif");
		topbt_03_topbt_04_over = newImage("images/topbt_03.gif");
		topbt_04_topbt_03_over = newImage("images/topbt_04.gif");
		topbt_04_over = newImage("images/topbt_04-over.gif");
		topbt_04_topbt_05_over = newImage("images/topbt_04.gif");
		topbt_05_topbt_06_over = newImage("images/topbt_05.gif");
		topbt_05_topbt_04_over = newImage("images/topbt_05.gif");
		topbt_05_over = newImage("images/topbt_05-over.gif");
		topbt_06_over = newImage("images/topbt_06-over.gif");
		topbt_06_topbt_07_over = newImage("images/topbt_06.gif");
		topbt_06_topbt_05_over = newImage("images/topbt_06.gif");
		topbt_07_topbt_06_over = newImage("images/topbt_07.gif");
		topbt_07_over = newImage("images/topbt_07-over.gif");
		topbt_07_topbt_08_over = newImage("images/topbt_07.gif");
		topbt_08_topbt_07_over = newImage("images/topbt_08.gif");
		topbt_08_over = newImage("images/topbt_08-over.gif");
		topbt_08_topbt_09_over = newImage("images/topbt_08.gif");
		topbt_09_topbt_08_over = newImage("images/topbt_09.gif");
		topbt_09_over = newImage("images/topbt_09-over.gif");
		topbt_09_topbt_10_over = newImage("images/topbt_09.gif");
		topbt_10_topbt_09_over = newImage("images/topbt_10.gif");
		topbt_10_over = newImage("images/topbt_10-over.gif");
		topbt_10_topbt_11_over = newImage("images/topbt_10.gif");
		topbt_11_topbt_10_over = newImage("images/topbt_11.gif");
		topbt_11_over = newImage("images/topbt_11-over.gif");
		topbt_11_topbt_12_over = newImage("images/topbt_11.gif");
		topbt_12_topbt_11_over = newImage("images/topbt_12.gif");
		topbt_12_over = newImage("images/topbt_12-over.gif");
		preloadFlag = true;
	}
}