OK I am pulling my hair out here trying to get this to work. Can someone please help me.

In styles, what does .inline_selected do?
It seems to work in preview and do what I want it to do, ie. change color when mouse is over that thread name (right?), but online on my test forum that just isn't happening. Why? Do I have to "turn it on" somewhere, or can someone just tell me how I get this thing going.

This one small thing is driving me nuts.

Thank you.