problem with cached images with apache as proxy to weblogic

["Gaute Lote" <gautelote@xxxxxxxxx>]

Hi,

we have apache 1.3.4 as a proxy for weblogic 8.1 using the  weblogic proxy plugin.
In a jsp we show a image that is stored in our db as a blob, and when we access that page via apache we always have to refresh 
the page to get the correct image showing in the browser.
 
If we go direct to the weblogic server then we always get the image that was loaded from the database.
 The browser is IE 6.

I have tried various settings in the 
httpd.conf, but can't get it to work

this is our jspcode, the image is a byte[] put in the session attribute "signatur":
  <logic:present scope="session" name="signatur">
	  <tr>
	    <th>Signatur:</th>
	   <td colspan="7"><img src="" width="220" height="70" alt="" border="0" ></td>

Gaute