var newwindow = '';

function popitup(url, wUrl, hUrl, sbUrl) {
	if (!newwindow.closed && newwindow.location) {
		newwindow.location.href = url;
	}
	else {
		newwindow=window.open(url,'_blank','width='+wUrl+', height='+hUrl+', scrollbars='+sbUrl);
		if (!newwindow.opener) newwindow.opener = self;
	}
	if (window.focus) {newwindow.focus()}
	return false;
}