function beginTest()
{
    var mess = '<?xml version="1.0" encoding="utf-8"?><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><Echo xmlns="http://blahblah.com/Services/"><s>string</s></Echo></soap:Body></soap:Envelope>';
    var service = '/services-1.0/Test.asmx/Echo';

    $.ajax({
        url: service,
        type: "POST",
        dataType: "xml",
        data: mess,
        complete: endTest,
        error: processError,
        contentType: "text/xml"
    });

    return false;
}

function endTest(xmlHttpRequest, status)
{
    $(xmlHttpRequest.responseXML).find('string').each(function()
        {
            var name = $(this).text();
            document.getElementById("myDiv").innerHTML = name;
        }
    );
}

function processError(data, status, req) {
    document.getElementById("myDiv").innerHTML = req.responseText + " " + status + " " + req;
}