function popDemo(p) {
  var options = 'toolbar=0,'+
                'menubar=0,'+
                'location=0,'+
                'status=0,'+
                'scrollbars=0,'+
                'top=0,'+
                'left=0,'+
                'height=600,'+
                'width=800';

  window.open('http://www.aces.us/screen_demo.php?product='+p,'demo_win',options);
}