window.onload = function() {
  if (!document.getElementsByTagName) return false;
  var lnks = document.getElementsByTagName("a");
  for (var i=0; i<lnks.length; i++) {
    if (lnks[i].getAttribute("class") == "audiopop") {
      lnks[i].onclick = function() {
        popUp2(this.getAttribute("href"));
        return false;
      }
    }
  }
}

function popUp2(winURL) {
  window.open(winURL,"audiopop","width=400,height=180");
}