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function checkEmail ( ) {

      request = createRequest ( ) ;
      if (request == null)
         alert("unable to create request");
      else {
         var email = document.getElementById("email").value;
         var val = escape(email);
         var url = "php/validate.php?tape=email&val=" + val +
         "&label=email";

         request.open("GET", url, true);
         request.onreadystatechange = updateEmailStatus;
         request.send(null);
      }
}