Global variable is not showing result inside a ajax call

Hi all
 
Here index is a global variable. I am manipulating the index in another function.
 
After that I call this function. its showing the actual result outside and after the ajax call but not showing inside the ajax call.

var urlSearch = "http://192.168.10.113/collective-intellegence/UserClickPersonClassifier?userid=1&query=asp.net";
alert(index);
$.ajax({
    url: urlSearch,
    type: 'POST',
    dataType: 'json',
    success: function (data) {
        alert(index);
    }
});

Is there any mistake done by me.
 
Please help to solve this problem.
 
Thanks in advance.