try { document.addEventListener('click', handleClick, false);
     } catch(e) {
     if(document.attachEvent){ document.attachEvent('onclick', handleClick);}
     else                    { document.onclick = handleClick;}
 }

 function handleClick(e)
 {
  var event = e || window.event;
  if(event.ctrlKey || event.shiftKey || event.altKey) return true;
  if(event.which && event.which != 1) return true;

  var target = event.target || event.srcElement;
  while(target && !/^a$/i.test(target.nodeName)) {
   target = target.parentNode;
  }

  if(!target || !target.getAttribute('rel')) return true;

  var rel = target.getAttribute('rel');
  var href = target.getAttribute('href');
  switch(rel) {

   case 'illustration':
    window.open(href, '', 'width=840,height=586,resizable=yes,scrollbars=1');
    break;

   case 'sketch':
    window.open(href, '', 'width=840,height=586,resizable=yes,scrollbars=1');
    break;

   case 'splash':
    window.open(href, '', 'width=840,height=586,resizable=yes,scrollbars=1');
    break;

   case 'external':
    window.open(href,"_blank");
    break;
    default:
   return true;
  }

  try { event.preventDefault(); } catch(e){}
   return false;
  }