Error with jsonpCallback. Internal Server Errror - web-services

I'm trying to access ajax (jquery-mobile and PhoneGap) to a web service (asmx), but something is wrong and what is not.
This is the js code:
$.ajax({
type : "POST",
url : webMethod,
data : param,
dataType : 'jsonp',
jsonp : 'callback',
jsonpCallback : 'jsonpCallback',
success : function(data) {
alert(data.nombre);
},
error : function(x,y,z) {
alert("-- " + x+'\n'+y+'\n'+z + " --");
}
});
function jsonpCallback(){
alert("OK");
}
and the web service (asmx)
[WebMethod]
[ScriptMethod(ResponseFormat = ResponseFormat.Json)]
public void WebServiceTest()
{
HttpContext.Current.Response.ContentType = "application/json";
string qs = HttpContext.Current.Request.QueryString["jsonpCallback"];
HttpContext.Current.Response.Write(qs + "( [{ \"name\": \"John\", \"message\": \"Ok\"}] )");
}
When I run the debug gives me an error -->
callback=jsonpCallback&_=1343139529496 500 (Internal Server Error)
I have already tried a thousand things (or at least that's the feeling I have ...)
I would greatly appreciate your suggestions.
P. S. Forgive my poor English

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