problem post ajax with data

problem post ajax with data

Hi

I'm trying to do a ajax post with data like this
$.ajax({
           type: "POST",
           url: url,
           data: var_send,
           success: function(data){
            p_html(data);
           }
});

in the var var_send the value is {"mod":"new", "RELATGPEVT_RELATCOD","2"}

and when i do the ajax they do a GET (id o with POST) but never calling the success, they occur when i use the "data" in ajax, when it's empty they work's fine

I try to use the traditional:true and the processData: false nut not work

Can anyone please help me ??

ps : i'm brazillian, sorry for the grammar