hmm cant you just add 192.168.1.2.. in your form as an action..
for example
<form method=\"Post\" action=\"192.168.1.2/index.php?uid={$_GET['uid']}\">
If not then just use the header function
if($uid == $POST['uid']){
header("location: http://192.168.1.2/bla.php?uid={$GET['uid']}");