signature problems

well i have no signature, and when im adding .jpg userbar i got this msg:

Quote:

You have included 2 images in your message. You are limited to using 1 images so please go back and correct the problem and then continue again. Images include use of smilies, the BB code [img] tag and HTML <img> tags. The use of these is all subject to them being enabled by the administrator.

but there is no images.... and next, why only 1 image can have? and why no .gif's?:/