Advanced Poll Fatal error : own function

Hello, I'm Yumi. :o
I installed Advanced Poll 2.02 textfile-ver on Linux,Apache(Rental server).
PHP Version 4.2.4-dev.
The check of operation was successful.
But it will not work, if it writes in the existing my index.php.

"Fatal error: Cannot redeclare newlink() (previously declared in ---"

"newlink()" is the function which I made and is described to the common header.
I do not want to remove.
What should it carry out for losing an error?

Transmitting with the "Vote" button is OK.
If an argument is attached to URL, the same error will come out.

(Origin)
index.php?color=red
e.t.c...arguments is used.
Operation O.K.

(After)
index.php?color=red
index.php?action=results&poll_ident=1
e.t.c...
Operation N.G.

It solved!
The problem was in somewhere else.
I disturbed.Sorry!