404 custom handler on a cgi-wrap PHP - No input specified error

Hi, This maybe a PHP problem, but is associated with Apache too - so my apologies if it is slightly off topic. My web hosts use a CGI wrap version of PHP 4.3.10 I have made a 404 custom error handler, using .htaccess in a directory - it is usppoed to route all unfound pages to error.php, and works as expected for .htm and .html pages as well as gifs etc. But ofr .php scripts, e.g /path/to/wrongurl.php it doesnt show my page - instead it shows No Input file specified.. After some Googling I have only found people witht eh similar problem without solutions. Can any one help me on this? I should say that in IE it just gets the default 404 ( I think this is windows own one responding to the particular http response header) - in firefox you get the 'No input ' error thanks for any advice Luke -- lukebarker@gmail.com