initPopups = function() {
  var els = document.getElementsByTagName("a");
  for(var i = 0; i < els.length; i++) {
    if (els[i].className.indexOf("popup") !=- 1) {
      els[i].onclick=popup;
    }
  }  
  for(var i = 0; i < els.length; i++) {
    if (els[i].className.indexOf("popupba") !=- 1) {
      els[i].onclick=popupba;
    }
  }   
}

popup = function() {
    var win=window.open(this.href, "popup", "width=400,height=400, scrollbars=no, resizable=no");
	return false; 
}

popupba = function() {
    var win=window.open(this.href, "popupba", "width=500,height=500, scrollbars=no, resizable=no");
	return false; 
}

window.onload = initPopups;