Null Variables after session_register() ( Radio Inputs Problem )

Apologies if this has been asked before, I'm experiencing problems with Session Variables and Radio Inputs values. For some reason, after I use session_register("number") where $number has 3 possible values { 1,2,3 }, $number IS NULL. If I don't use session_register("number"), $number IS NOT NULL. I did not see any difference with checkbox inputs either. Any help would be greatly appreciated. Thank you. -gohaku <!--Form.html--> <form action="session.php" method="POST"> Name: <input type="text" name="name" size="30"><br> <input type="radio" name="number" value="1" CHECKED>1<br> <input type="radio" name="number" value="2">2<br> <input type="radio" name="number" value="3">3<br> <input type="submit" name="submit" value="Session Test"> </form> <? /***********Session.php**********/ $varcount = 0; if($name) { $varcount++; } if($number){ $varcount++; } session_start(); session_register("name"); session_register("number"); ?> <html> <head><title><?=$number?></title></head>