function pop_upload(FieldName, upload_text, upload_instructions, upload_directory){
  var w = 400;
  var h = 250;
  var winX = (screen.availWidth - w)*.5;
  var winY = (screen.availHeight - h)*.5;
  window.open("/admin/common/file_submit.asp?FieldName=" + FieldName + "&upload_text=" + upload_text + "&upload_instructions=" + upload_instructions + "&upload_directory=" + upload_directory, "DisplayWindow","scrollbars=no,alwaysRaised=yes,resizable=no,width=" + w + ",height=" + h + ",left=" + winX + ",top=" + winY);
  }