function popSetup() {
	links = document.getElementsByTagName("a");
	for(var i=0;i<links.length;i++){
		if(links[i].rel == 'popup') {
			links[i].setAttribute('target','_lrgimg');
		}
	}	
}

function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      oldonload();
      func();
    }
  }
}

addLoadEvent(popSetup);