Unable to call VBScript sub from JavaScript function

[Velosai]

I am trying to call VBScript from within JavaScript, but it keeps erroring out saying "Object expect or is null". Any suggestions?

Code:

<script type="text/javascript">
  function pageInit() {
     fld.onkeyup = function () {
        //carry basic checks to ensure ID is complete
        eDirectory(userID);
     }
  }
</script> 

<script type="text/vbscript">
  Sub eDirectory(userID)
      'Process the request to LDAP server
  End Sub
</script>

All the code works (sorry I haven't put it all in here) and works fine in its own chunks. Its just this issue of referencing VBScript from JavaScript.

Thanks