Hi

I'm Using a forum on this hosting service
and when i try to upload photos for the members
it says

Warning: move_uploaded_file() [function.move-uploaded-file]: SAFE MODE Restriction in effect. The script whose uid is 22338 is not allowed to access /tmp owned by uid 0 in /includes/class_upload.php on line 413


so it needs to make the safe mode off

so i need to know how to make it off, and if it turned of, what i should be careful off
Is this will make it easier for the hacker to hack my site or what

plz i need a quick answer and thank u very much