Workflow approval using SharePoint Webservices

Hi everyone,

As a first step, in InitWebservice function I build the xml needed to be sent in the webservice request.

function InitWebService(approve , itemUrl, taskItemId, taskListId ) {
    var taskStatus;
    if (approve == true) {
        taskStatus = 'Approved';
    }
    else {
        taskStatus = 'Rejected';
    }
    var soapReq = "<soap:Envelope xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\">"
                          + "<soap:Body>"
                            + "<AlterToDo xmlns=\"http://schemas.microsoft.com/sharepoint/soap/workflow/\">"
                              + "<item>" + itemUrl + "</item>"
                              + "<todoId>" + taskItemId + "</todoId>"
                              + "<todoListId>" + taskListId + "</todoListId>"
                              + "<taskData>"
                                   + "<my:myFields xmlns:my=\"http://schemas.microsoft.com/office/infopath/2003/myXSD\" >"
                                        + "<my:TaskStatus>" + taskStatus + "</my:TaskStatus>"
                                        + "<my:Status>Completed</my:Status>"
                                        + "<my:PercentComplete>1.00000000000000</my:PercentComplete>"
                                        + "<my:Completed>1</my:Completed>"
                    + "                  </my:myFields>"
                    + "              </taskData>"
                    + "          </AlterToDo>"
                    + "        </soap:Body>"
                    + "  </soap:Envelope>";
    ExecTask(soapReq, "http://schemas.microsoft.com/sharepoint/soap/workflow/AlterToDo"); }

To approve/reject the workflow, we have to use AlterToDo, so we add
"http://schemas.microsoft.com/sharepoint/soap/workflow/AlterToDo" as a request header.

function ExecTask(soapReq, headerAction) {
    $.ajax({
        url: webUrl + "/_vti_bin/workflow.asmx",
        beforeSend: function (xhr) {
            xhr.setRequestHeader("SOAPAction", headerAction);
        },
        type: "POST",
        dataType: "xml",
        data: soapReq,
        contentType: "text/xml; charset=\"utf-8\"",
        complete: OnExecWebServiceComlpete,
        success: OnSuccesRetreiveData,
        error: OnFailRetreiveData
    });
}