how can i write javascript code in asp for showing a progress circle during page upload on click event of submission button

Hi
pls go to the url http://www.kitchenstuff.com/ks_test/  for a nice understanding of problems
when i click on go button on search box page is redirect to search_result.asp but it take several times.
i want that when page upload then there should be a progress circle that shows the upload process of the page.
for this puppose i used the following code.

<!-- if using Classic ASP: -->
<%
Response.Buffer = true
%>

<!-- if using PHP: -->
<?
ob_start();
?>

<!-- this bit goes at the very top of the page: -->
<div id='interstitial'>
   <img src="LoadingAnimation.gif" width="50" height="50" alt="Loading ... Please wait... " />
</div>

<!-- This is for those times where you have to [asp: response.end] [php: exit(); ] for some reason-->
<script language="javascript">
    setTimeout('interstitial.style.display="none";',10000);
</script>

<!-- if using Classic ASP: -->
<%
response.flush
%>

<!-- if using PHP: -->
<?
ob_end_flush();
?>

<!--
Insert your entire page contents here, including calls to the database
-->

<!-- this bit goes at the very bottom of the page: -->
<script language="javascript">
     interstitial.style.display="none";
</script>


but prob is that circle starts on load event of search_result page. not on click event of GO button _click.
how can i use upper code on click event of button.
any other suggestion besides it.
any help will be appriciated.
Thanks