I have an issue with the getJSON method, here is the code of the jquery:

2. $(document).ready(function(){
3. $.getJSON('../php/functions/user_info.php', {id: id}, function(data){
4. alert(data);
5. });
6. });

the php code at  ../php/functions/user_info.php is:

2. <?php
3. require_once 'connection.php';
4. $link = conenct('localhost', 'root', '', 'w_db');
5. 
   
6. mysql_query( "SET NAMES utf8" );
7. mysql_query( "SET CHARACTER SET utf8" );
8. mysql_set_charset('utf8', $link);
9. 
   
10. $id = $_POST['id'];
11. $id = mysql_real_escape_string($id);
12. 
    
13. $query = mysql_query("SELECT * FROM users WHERE id = '$id'") or die('Invalid query:'. mysql_error());
14. $userInfo = mysql_fetch_assoc($query);
15. 
    
16. echo json_encode($userInfo );
17. ?>

When I am running the page no alert pops out. What is wrong with my code?!?!?

tnx!!