function offer(url, id) {
	height_popup = screen.height-120;
	if(height_popup > 900) {
		height_popup = 900;
	}
	align_h = (screen.width - 615) / 2;
	align_v = (screen.height - height_popup) / 3;
	window.open(url, id, 'height='+height_popup+', width=660, top='+align_v+', left='+align_h+', toolbar=no, menubar=no, location=no, resizable=yes, scrollbars=yes, status=no'); 
}