sounds like register_globals is OFF
if you have PHP >= 4.1.0 try:
<form name="inforamtion" method="post" action="<? echo "$_SERVER[PHP_SELF]"; ?>">
if you have PHP < 4.1.0 try:
<form name="inforamtion" method="post" action="<? echo "$HTTP_SERVER_VARS[PHP_SELF]"; ?>">