wow, you are like the millionth person to have this problem on this board! (i too had this same problem just a couple months ago :-)
Check you php.ini configuration to ensure register_globals is ON.
register_globals registers variables like $formVar, or $inputText.
The SAFE and SECURE way to get form variables is to use:
$_GET['formVar']
or $_POST['formVar'] (if your form METHOD is POST).
right now, to save yourself some troble, turn on register_globals in the php.ini file.
but i'd recommend you start using $GET and $POST in your new scripts... :-)
-sridhar