$(document).ready(function() {
    $("a[rel='cboxscreen']").colorbox({rel:'nofollow', preloading:false}); // not grouped
    $("a[rel^='cboxgroup']").colorbox(); // grouped: rel="cboxgroup" or rel="cboxgroup[groupname]"
    $("a[rel='cboxslideshow']").colorbox({slideshow:true});
    $("a[rel='cboxvideo']").colorbox({iframe:true, rel:'nofollow', innerWidth:660, innerHeight:515, preloading:false, scrolling:false});
  });