function SetPopupLinks() {
  var links = document.getElementsByTagName('a');
  for (var i = 0; i < links.length; i++) {
    if (links.item(i).className == 'popup_link') {
        links.item(i).onclick = function() {
          var survey = makePopup(this.href, 300, 300, 'scroll,resize');
          return survey.closed;
          }
    }
  }
}

function makePopup(url, width, height, overflow) {
  if (overflow == '' || !/^(scroll|resize|both)$/.test(overflow)) {
    overflow = 'both';
  }
  var win = window.open(url, '', 'width=' + width + ',height=' + height + ',scrollbars=' + (/^(scroll|both)$/.test(overflow) ? 'yes': 'no') + ',resizable=' + (/^(resize|both)$/.test(overflow) ? 'yes': 'no') + ',status=yes,toolbar=no,menubar=no,location=no');
  return win;
}