Untitled

<script type="text/javascript">
function check() {
  alert(document.body.innerHTML.match("<pageid>55660</pageid>") != null);
}
</script>

<html>
<body onload="check();">
  <table>
    <tr><td><pageId>55661</pageId></td></tr>
    <tr><td><pageId>55660</pageId></td></tr>
    <tr><td><pageId>55663</pageId></td></tr>
    <tr><td><pageId>55664</pageId></td></tr>
  </table>
</body>