How do I make the online/offline status icon a .PNG?

[محروم.كوم]

Hi, can someone tell me what I need to edit for the board to call up a .png for those images?

(default image = )

Here's why, I want to change them from the default .gif to a .png-- they appear in different areas of the site. In the postbit and in user profiles (there may be more? )

Those two areas have different background colors (at least on my forum). I feel like it will be easier to go ahead and use a png rather than a gif, this being the case. __DEFINE_LIKE_SHARE__