Facebook icon isn't displaying

Thanks for this plugin–it was just what I was looking for. I have a minor problem, though.

I can see that the plugin includes an icon for Facebook–it’s in the plugin directory as ‘facebook.png’. However, it doesn’t show in the widget, and according to a 404 notifier plugin I have, something keeps looking for “facebook.jpg” instead of “facebook.png”. It seems as though the plugin wants to load facebook.jpg, and is failing because there is no facebook.jpg, only facebook.png.

How can I solve this problem, and can I expect a fix to this in the next release?

Thanks.

http://wordpress.org/plugins/social-media-icons-widget/