Cannot upload pictures.

I am unable to get pictures uploaded into the Guestbook after signing due to the following:
"Warning: is_file(): open_basedir restriction in effect. File(..) is not within the allowed path(s): (../) in /data/hosted/bluebreeze/GuestBook/lib/add.class.php on line 69"

Can someone be able to help? Any suggestions will be greatly appreciated.

Thank you.

have you given chmod permissions to your tmp and public folders?

Yes, tried that.

are you trying to upload a file from your computer and what type of file is it
jpeg or what?

I tried to upload a .jpg file (30kb) 120 * 90 pixels.
(p.s- my permissible settings is 300 *120 pixels, 120 kb.
I tried to upload it while I sign my guestbook.

P.S- Thank you Spor for your help.

You will have to contact your host. They have applied open base directory restrictions. What this means, is that no file can write to another folder other than the one that it is in. So when addentry tries to write to the temp and to the public folder, it will pass this error. They need to enable unrestricted open base directory. This is usually put in effect by paranoid web hosts, who are scared of security risks