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) {
		foto_h_over = newImage("images/foto-h_over.jpg");
		foto_g_over = newImage("images/foto-g_over.jpg");
		foto_f_over = newImage("images/foto-f_over.jpg");
		foto_e_over = newImage("images/foto-e_over.jpg");
		foto_d_over = newImage("images/foto-d_over.jpg");
		foto_c_over = newImage("images/foto-c_over.jpg");
		foto_b_over = newImage("images/foto-b_over.jpg");
		foto_a_over = newImage("images/foto-a_over.jpg");
		a_over = newImage("images/a-over.gif");
		b_over = newImage("images/b-over.gif");
		c_over = newImage("images/c-over.gif");
		d_over = newImage("images/d-over.gif");
		e_over = newImage("images/e-over.gif");
		f_over = newImage("images/f-over.gif");
		g_h_over = newImage("images/g-h_over.gif");
		g_over = newImage("images/g-over.gif");
		h_over = newImage("images/h-over.gif");
		preloadFlag = true;
	}
}