var iCallId = 0;
    function performSpecificOperation(sMethod, sOp1, sOp2)
    {
      var oServiceHandler = document.getElementById("divServiceHandler");
      if (!oServiceHandler.Math)
      {
        oServiceHandler.useService(SERVICE_URL + "?WSDL", "Math");
      }
      iCallId = oServiceHandler.Math.callService(handleResponseFromBehavior,
                                                  sMethod, sOp1, sOp2);
    }
  
    
    //This handles the response
    function handleResponseFromBehavior(oResult)
    {
      var oResponseOutput = document.getElementById("txtResponse");
      if (oResult.error)
      {
        var sErrorMessage = oResult.errorDetail.code
                          + "\n" + oResult.errorDetail.string;
        alert("An error occurred:\n"
              + sErrorMessage
              + "See message pane for SOAP fault.");      
        oResponseOutput.value = oResult.errorDetail.raw.xml;
      }
      else
      {
        var oResultOutput = document.getElementById("txtResult");
        oResultOutput.value = oResult.value;
        oResponseOutput.value = oResult.raw.xml;
      }
    }