Having problems with uploading to gallery!

Please can anyone help...

For some reason I can't get photo's to upload to my gallery...
I have 100% free space, and the pictures I am trying to upload are alot smaller then asked for.

but it keeps saying that they are to big or corrupt.

I am trying to upload jpg pic's.

my forum is

http://overtherainbowcarers.forumotion.co.uk/index.htm

any help would be appreciated

thanks
Clare x

Try converting the pictures to
PNG or GIF

Hi & thanks for trying to help...
but it's not having it, no matter what format the pictures are in...
It's still saying the same thing.

I have two forums one for carers and one for sculpting in clay... and both are reporting the same problem..

Please does anyone know what the problem is!

thanks Clare