Why my $.get does not work?

Why my $.get does not work?


Dear Everyone
I make follow jQuery program using $.get but the return always is
undefined. Who can tell me why and How can I realize what I want?
Thanks in advance.
Wang Suya
.............
<html>
<head>
<script type="text/javascript" src="jquery-1[1].3.1.min.js"></script>
<script type="text/javascript" src="jquery-ui-
personalized-1.6rc6.js"></script>
<script>
function d(b){
alert(b);
if(b == 5){
$("input[name=bango]").attr("disabled","disabled");
}
}
</script>
</head>
<body>
<table>
<tr><td><input type = "submit" name = "bango" id = "bango" value = "番号取
得"></td></tr>
</table>
<script type="JavaScript" src="jquery-1[1].3.1.min.js"></script>
<script>
$.get("get_su.php",function(data){
alert(data.ban);
d(data.ban);
},"json");
</script>
</body>
....
get_su.php as bellow:
........
$json = new HTML_AJAX_JSON();
$js = $json->encode(array("ban"=>"1111"));
print"$js";
........