var newwindow = '';
function popitup(url) {
	if (newwindow.location && !newwindow.closed) {
		newwindow.location.href = url;
		newwindow.focus(); }
	else {
		newwindow=window.open(url,'htmlname','width=750,height=600,resizable=1');}
	}

function tidy() {
	if (newwindow.location && !newwindow.closed) {
		newwindow.close(); 
	}
}