My Sig? Help Please

Okay i made a 3d sig real quick just to test it out and everytime i put it in my control panel or forums it shows like a white line around the outside of the sig. here is an example.



any help would be appreciated is it just that the render wasnt cut out well or what? Help is very much appreciated ive been trying this for 2 days and evertime i always get a white line around the outside render.

Edit-Here is another one using a differnt render and still the same outcome


Help PLease

 

were u saving them as gif before u saved them as png?

 

if you save it as a GIF, then don't use the "white matte" option, if you can, use "no matte"

 

I save them as png then upload them.

Edit- i saved it as a png again and then put no matte and it worked! Yay! you guys are the best (very sexy).