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) {
		obrazy_over = newImage("images/obrazy-over.jpg");
		obrazy_down = newImage("images/obrazy-down.jpg");
		vazy_over = newImage("images/vazy-over.jpg");
		vazy_down = newImage("images/vazy-down.jpg");
		lampy_over = newImage("images/lampy-over.jpg");
		lampy_down = newImage("images/lampy-down.jpg");
		kvetinace_over = newImage("images/kvetinace-over.jpg");
		kvetinace_down = newImage("images/kvetinace-down.jpg");		
		textil_over = newImage("images/textil-over.jpg");
		textil_down = newImage("images/textil-down.jpg");
		nabytek_over = newImage("images/nabytek-over.jpg");
		nabytek_down = newImage("images/nabytek-down.jpg");
		shop_but01_01_over = newImage("images/shop_but01_01-over.gif");
		shop_but01_01_down = newImage("images/shop_but01_01-down.gif");
		preloadFlag = true;
	}
}