s-8_1_1_2.js

$.ajax({
    url: "http://localhost:53920/MyServiceSample.svc/jsonp/DoSomeWork?request=" + 
        JSON.stringify({ Param1: 1, Param2: "bla"}) + 
        "&callback=?",
    contentType: "application/json",
    dataType: "json",
    type: "GET",
    success: function(data) {
        if (data.success) {
            // do some stuff...
        }
    }
});