I have a php based website and signup form Security Code Image is not showing in signup form. please hep me to solve this issue. my signup.php is as under.

Code:
<?
include('geturl.php');
?> <script type="text/javascript">

function ismaxlength(obj){
var mlength=obj.getAttribute? parseInt(obj.getAttribute("maxlength")) : ""
if (obj.getAttribute &&
...