var newwindow = ''
function popItUp(url) {
if (newwindow.location && !newwindow.closed) {
    newwindow.location.href = url;
    newwindow.focus(); }
else {
    newwindow=window.open(url,'htmlname','width=640,height=600,resizable=yes,scrollbars=yes');}
}

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