function addLoadEvent(func) {

  var oldonload = window.onload;
  if (window.onload) {
    window.onload = function() {
      oldonload();
      func();
    }
  } else {
    window.onload = func;
  }
}

// Begin popup window function.
function popUps() {

	if (!document.getElementsByTagName) return false;
	
	var links = document.getElementsByTagName("a");
	
	for (var i=0; i<links.length; i++) {
	link = links[i];
		if (link.getAttribute("rel") == "popup") {
			link.onclick = function() {
				popUp(this.getAttribute("href"));
				return false;
			}  
		}
	}
}

// uses class attribute of link to determine size of popup.

function popUp(winURL) {
  window.open(winURL,"popup","width=600,height=400,scrollbars=yes,resizable=yes,status=no");
}


addLoadEvent(popUps);