Security icons.

[cityrunways]

I've been trying to change the security icons in my layout but I haven't been able to find a way that works. I tried this tutorial, but it didn't work. This is the only thing I can find in my coding which pertains to security icons. I've also tried working with this, but I haven't figured it out.

.subject img[src="http://stat.livejournal.com/img/icon_protected.gif"]{width: 0; height: 0; padding: 8px 10px 0px 0px; background:

url(http://img292.imageshack.us/img292/5663/heartbb2.gif);}
.subject img[src="http://stat.livejournal.com/img/icon_private.gif"]{width: 0; height: 0; padding: 9px 9px 0px 0px; background: