suggest session_url_addid()
ob_start();
........
$html = ob_get_contents();
ob_end_clear();
compress $html;
echo $html;

there's no PHPSESSID in the url even browser not support cookie

so...
compress session_url_addid($html);
echo $html;

this would be better.
or give out the php source code to show us how to add PHPSESSID in all of the url, including <FORM>

hoho~~~~~