function productPopup(path, title, width, height)
 {
   if(width==undefined)
     width = 500;
   if(height==undefined)
     height = 400;

   new_left = Math.round(window.screen.width / 2 - width / 2);
   new_top = Math.round(window.screen.height / 2 - height / 2);

   params = 'width=' + width + ',height=' + height + ',left=' + new_left + ',top=' + new_top + ',scrollbars = yes';

   window.open(path, '', params);
 }