SSL Lock not showing

I am trying to install ssl on this site. Theme churchope. The lock is not showing. I am getting this error: Attackers might be able to see the images you’re looking at on this site and trick you by modifying them.

There are two images: http://www.ssbdwels.com/wp-content/themes/churchope/images/bg_footer.png and http://www.ssbdwels.com/wp-content/themes/churchope/images/bg_button.png which are not switching to https. Can anyone help me resolve this?

The page I need help with: [log in to see the link]