AJAX - Acceder a servicio web mediante ajax

<script type="text/javascript">

    var webServiceURL = 'http://local_server_name/servicio/nombreServicio.wsdl';

    var peticionXML = ' Mensaje en formato XML';

    function CallService()

    {

        $.ajax({

            url: webServiceURL,

            type: "POST",

            dataType: "xml",

            data: peticionXML,

            contentType: "text/xml; charset=\"utf-8\"",

            success: OnSuccess,

            error: OnError

        });

        return false;

    }

    function OnSuccess(data, status)

    {

        alert(data.d);

    }

    function OnError(request, status, error)

    {

        alert('error');

    }

    $(document).ready(function() {

        jQuery.support.cors = true;

    });

</script>

<form method="post" action="">

    <div>

        <input type="button" value="Call Web Service" onclick="CallService(); return false;" />

    </div>

</form>