posting data to same form document problem

Hi. I'm having problems with making a form post data to the same document containing the form code when clicking on the submit button. Check out the code below, it works perfectly under Linux, but not in Win2k/IIS5 with PHP v. 4.0.3pl1. Filename : form.php4 <HTML><HEAD><TITLE>Posting formdata to form.php4</TITLE></HEAD> <BODY> <FORM METHOD="POST" ACTION="form.php4"> <INPUT TYPE="HIDDEN" NAME="countpost" VALUE="<?PHP print $countpost + 1;?>"> <?PHP if ($countpost == 0) print "1"; } elseif ($countpost == 1) print "2"; } ?> <INPUT TYPE="SUBMIT" NAME="Submit"> </FORM> </BODY> </HTML> I do have these options defined as on: register_globals magic_quotes_gpc I'd really appreciate any kind of feedback concerning this issue. Thanks, /Stefan Högdahl