function preparePopUps() {
	if (!document.getElementsByTagName) return false;
	var lnks = document.getElementsByTagName("a");
	for (var i=0; i<lnks.length; i++) {
		if (lnks[i].className.indexOf("popup") == -1) continue;
		lnks[i].onclick = function() {
			window.open(this.href);
			return false;
		}
		lnks[i].onkeypress = lnks[i].onclick;
	}
}

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

addLoadEvent(preparePopUps);