White outside line

I made some buttons in Adobe Photoshop,but when I used them in my forum,there was a white outside line.What am I doing wrong?Please tell me so I won't do the same mistake with the rest of the buttons.
http://gerrybutlerfans.darkbb.com/index.htm?sid=c76c84a9f746ad4a711c3e5ddb82801f

Looks like you used a white BG for your buttons. I don't know or use Adobe, but there should be a setting for a transparent BG somewhere. It would be simple to fix in a free editor like Irfanview, but it would also reset the buttons to static.