[N9ne]

Vars are being passed on through a form; make sure that all the vars that you are using are in the previous page, in input tags, as the name="xxx" part, if they aren't, then if you use the variable on the next page, it won't work.

E.G.

<form type="post" blah blah blah>
<input NAME="BLAHBLAH" lkjsdlfkjsdlkjsdf>sldkfsdlk
<input type="submit">sdfsdf
</form>

next page:
if ($BLAHBLAH=="1") {
$elephants="fly";
}

That will work, because BLAHBLAH is the name of the input field on the previous page.