Oops, I broke it again...

[Nelson, Bradley]

debian 2.2r2
apache 1.3.9-13.1
php4.0.3pl1-0potato1.1

I was trying to get rid of the backslash thing (can\'t) in IMP so I upgraded
to php4.
Now when I try to get my mail it actually tries to download the index.php3
file instead of opening it.
follow symlinks is on and index.php3 is in my httpd.conf on the
DirectoryIndex line 
is there something I have to change in my defaults.php3 file to point to
php4 instead of php3 on the apache server side?

I had everything configured and running with php3 but it all broke when I
loaded php4.

Thanks in advance for any help...