อยากทราบวิธีทำ auto select ครับ แบบว่า เลือก user จากลิตเมนูแล้ว ข้อมูลของ user จะแสดงออกมาเลย โดยไม่ต้องกด submit ครับ

<script type="text/javascript">
function showMember(str)
{
if (str=="")
  {
  document.getElementById("txtHint").innerHTML="";
  return;
  } 
if (window.XMLHttpRequest)
  {// code for IE7+, Firefox, Chrome, Opera, Safari
  xmlhttp=new XMLHttpRequest();
  }
else
  {// code for IE6, IE5
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
xmlhttp.onreadystatechange=function()
  {
  if (xmlhttp.readyState==4 && xmlhttp.status==200)
    {
    document.getElementById("txtHint").innerHTML=xmlhttp.responseText;
    }
  }
xmlhttp.open("GET","data.php?q="+str,true);
xmlhttp.send();
}
</script>

<form name="form1">
<select name="memner" onchange="showMember(this.value)">
<option value="0">เลือก Member</option>
<?
	mysql_select_db($database_connect_db, $connect_db);
	mysql_query("set NAMES tis620");
	$strSQL = "SELECT member_id,name FROM member";
	$result = mysql_query( $strSQL, $connect_db);
	while ( $rs = mysql_fetch_array($result))
		{	
			if  ($rs['member_id'] == $memner)
				echo "<option value=\"$rs[member_id]\" selected>$rs[name]</option>\n"
			else
				echo "<option value=\"$rs[member_id]\">$rs[name]</option>\n";
		}
?>
</select>
</form>

<div id="txtHint"><b>Table info will be listed here.</b></div>

<?php
	mysql_close($connect_db);
?>

<?php
require("Connections/connect_db.php");

$member_id = $_GET["q"];

$sql="SELECT name,surname,sex FROM member WHERE member_id = '".$member_id."' ";
$result = mysql_query($sql);

?>

<table width="100%" border="0" cellpadding="1" cellspacing="1">
  <tr height="35">
    <td><div align="center"><h4>name</h4></div></td>
    <td><div align="center">surname</div></td>
    <td><div align="center">sex</div></td>
  </tr>
<?php
while($fd = mysql_fetch_array($result)) {
?>
  <tr>
	<td><div align="center"><?php echo $fd['name']; ?></div></td>
    <td><div align="center"><?php echo $fd['surname']; ?></div></td>
    <td><div align="center"><?php echo $fd['sex']; ?></div></td>
  </tr>
<?php 
	} //end while

	mysql_close($connect_db);
?>