jquery - AJAX POST to PHP script -

i'm trying post program separate php file, grab data , store sql database. i've checked code on , on , can't' find i'm doing wrong. appreciated.

ajax

$(".btn btn-success last").click(function(){         $.post("go2.php",         {              name: "donald duck",              city: "duckburg"         },         function(data, status){              alert("data: " + data + "\nstatus: " + status);             });     }); 

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php file (go2.php) w/ sql code

    <?php  include 'connection.php';  $x = $_post["name"]; $sql = "insert users (username) values ('$x') "; $query = mysql_query($sql);    ?> 

try long version of ajax request

$(document).ready( function () {          $(".btn btn-success last").click(function(){                                     $.ajax({                 type: "post",                url: "go2.php",                 data: {name:"donald duck", city:"duckburg"},                success: function(data){                     document.getelementbyid('divid').html(data);                }             });         });     }); 

for echo data, have echo message in go2.php "success"