function openWin (url,width,height,extras) {
	if (window.open) {
		if (width < 0 || height < 0) {
			newWin = window.open(url,"",extras);
		} else {
			newWin = window.open(url,"","width="+ width +",height="+ height +","+ extras);
		}
	} else {
		return false;
	}
}