Ajax call to web service

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Javascript

Ajax

webservice

We need to communicate with a Web Service via scripting (javascript, vbscript, jquery). We are getting an error trying to communicate with the Web Service. From the articles I have read it seems this line needs to be added into the Web Service:

[System.Web.Script.Services.ScriptService]

. Thing is we are not able to add this into service as it's a published site that comes with the software.

Will I be able to still call this service without that attribute? Is there anything else I can do to make the call using scripting language?

What I have tried:

<script type="text/javascript">
    $(document).ready(function()
        {
            $.ajax
                (
                {
                    type: "POST",
                    url: "myurl/method",
                    data: "{Operator:'elizma',OperatorPassword:'test',CompanyId:'T',CompanyPassword:'test',LanguageCode:'AUTO',LogLevel:'ldNoDebug',EncoreInstance:'EncoreInstance_0',XmlIn:''}",
                    contentType: "application/json; charset=utf-8",
                    datatype: "json",
                    success: OnSuccessCall,
                    error: OnErrorCall
                }
            );
        }
    );

    function OnSuccessCall(response) {
        alert(response.d);
    }


    function OnErrorCall(response) {
        alert(response.status + " " + response.statusText);
    }

</script>