var _POPUP_FEATURES = 'location=0,  statusbar=0,  menubar=0,  width=580,  height=500, scrollbars=yes, resizable=yes';

function raw_popup(url, target, features) {
  if (isUndefined(target)) {
    target = '_blank';
  }
  var theWindow =
    window.open(url, target, features);
  theWindow.focus();
  //return theWindow;
}

function link_popup(src, features) {
  if (isUndefined(features)) {
    features = _POPUP_FEATURES;
  }
  //return
  raw_popup(src.getAttribute('href'), src.getAttribute('target') || '_blank', features);
}

function isUndefined(a) {
    return typeof a == 'undefined';
}