it's giving parse error, and i can't find the mistake

[Fking]

<? if (!$logo) then $logo='http://mydomain.com/design/logo.gif'; ?>

this line is giving parse error, why?

here is the idea, if $logo still does not have value, 'http://mydomain.com/design/logo.gif' to become the value

[dnast]

Take out "then"

[Fking]

huh.... thanks :>