function openAvailabilityPopup() {
  window.open('index.php?StoryID=221', '_blank', 'toolbar=no,statusbar=no,scrollbars=no,menubar=no,width=350,height=150');
}

function openImagePopup(img_src, img_width, img_height) { 
  img_width = parseInt(img_width) + 20; 
  img_height = parseInt(img_height) + 20; 
  window.open(img_src, '_blank', 'toolbar=no,statusbar=no,scrollbars=no,menubar=no,width=' + img_width + ',height=' + img_height); 
}

function openDownloadPopup(aid_str) {
  window.open('index.php?StoryID=222&article_ids=' + aid_str, '_blank', 'toolbar=no,statusbar=no,scrollbars=yes,menubar=no,width=330,height=320');
}

function checkInput(evt) {
  //if (isFirefox) {
    if ((evt.keyCode < 48 || evt.keyCode > 57) &&  evt.keyCode!=13) return true;
  //}
  //else {
  //  if (event.keyCode<48 || event.keyCode>57) return true;
  //}
  return false;
}