xjax读取数据 急急急.....

现在是点击按钮才显示出我想要的信息，怎样不用操作按钮，直接在网页中显示出select_show()中的信息
<?php
define ('XAJAX_DEFAULT_CHAR_ENCODING', 'gb2312');
require ('xajax/xajax_core/xajax.inc.php');
function select_show()
{
$book_ip="127.0.0.1";
$Mbook_root="root";
$book_qa="123456";
$book_class="book";
$connect=@mysql_connect($book_ip,$book_root,$book_qa);
@mysql_select_db($book_class);
@mysql_query("set names 'GB2312'"); 
$sql = "SELECT * FROM mdenin_tag LIMIT 0 , 12";
$obj = @mysql_query($sql);
while($row=@mysql_fetch_array($obj))
{
$a[]= $row[1];
  }
return $a;



}

function helloWorld($isCaps)
{
$text = select_show();
$objResponse = new xajaxResponse();
$objResponse->assign("div1sss","innerHTML",$text);

return $objResponse;
}
$xajax = new xajax(); 
$xajax->registerFunction("helloWorld");
$xajax->registerFunction("setColor");
$xajax->processRequest();
?>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>测式</title>
<?php $xajax->printJavascript('xajax/'); ?>
</head>
<body>
  <div id="div1sss" name="div1sss"></div>
<br/>

<button onClick="xajax_helloWorld('0')">Click Me</button>
</body>
</html>