var _POPUP_FEATURES = 'location=0,statusbar=0,menubar=0,width=400,height=300';

function raw_popup(url, target, features) {

  var theWindow =
    window.open(url, target, features);
  theWindow.focus();
  return theWindow;
}

function link_popup(src, features) {
  return
    raw_popup(src.getAttribute('href'),
    src.getAttribute('target') || '_blank',
    features);
}