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) {
		bott_02_bott_04_over = newImage("images/interface/bott_02-bott_04_o.gif");
		bott_02_bott_05_over = newImage("images/interface/bott_02-bott_05_o.gif");
		bott_02_bott_06_over = newImage("images/interface/bott_02-bott_06_o.gif");
		bott_02_bott_07_over = newImage("images/interface/bott_02-bott_07_o.gif");
		bott_06_bott_04_over = newImage("images/interface/bott_06-bott_04_o.gif");
		bott_07_bott_06_over = newImage("images/interface/bott_07-bott_06_o.gif");
		
		left_01_over = newImage("images/interface/left_01-over.gif");
		left_02_over = newImage("images/interface/left_02-over.gif");
		left_03_over = newImage("images/interface/left_03-over.gif");
		left_04_over = newImage("images/interface/left_04-over.gif");
		left_05_over = newImage("images/interface/left_05-over.gif");
		left_06_over = newImage("images/interface/left_06-over.gif");
		left_07_over = newImage("images/interface/left_07-over.gif");
		preloadFlag = true;		
	}
}