problem using jquery ajax

problem using jquery ajax


Hello all,
I was trying to use ajax functionality of jquery and was not successful. I was trying to print data from test.php in query.php. 

--------------------query.php-------------------------------------
<script>
function retreiveData(){
                              $.ajax({
                                        url: 'test.php',
                                        type: "GET",
                                        contentType: 'text',
                                        cache: false,
                                        error: function(e,xhr){
                                                alert('error getting data');
                                        },
                                        success: function(data){
                                                alert(data);
                                        }
                                });
}

</script>

-------------------test.php-----------------------------
<?PHP
header('Content-type: text');
$data= array ('a'=>1,'b'=>2,'c'=>3,'d'=>4,'e'=>5);
//echo $data;
return $data;
?>

Please help me to get out of this situation. I am actually using jquery for other effects in my website and also want to use it for ajax purpose. 

Thanks all