[jQuery] Problem with URL formatting with $.ajax

[acedanger]

Here is my code:

$.ajax({
                url: lUrl,
                global: true,
                async: false,
                data:{"none":"none"},
                type: "GET",
                dataType: "text",
                success: function(result){
                        alert("result is "+result);
                        parsedJSON = JSON.parse(data);
                },
                error: function (XMLHttpRequest, textStatus, errorThrown) {
                        alert(textStatus);
                }
});

All of my urls that are sent to the server have "?_=(some random
number)". In the specific case of the above code, the generated URL is
"http://url/script.php?_=1254497109001&none=none";. How can I prevent
this from happening? Why is it happening?