I tried that method but for some reason, it still wouldnt work. Some strange versions on IE would still hold onto the cache. Here’s an exerpt from my post (http://www.designmills.com/2008/03/21/ajax-and-ie-7-cache-not-invalidating/):

response.setDateHeader( “Expires”, -1 );
response.setHeader( “Cache-Control”, “private” );
response.setHeader( “Last-Modified”, new Date().toString() );
response.setHeader( “Pragma”, “no-cache” );
response.setHeader( “Cache-Control”, “no-store, no-cache, must-revalidate” );