UBB.Developers Forums UBB.threads 6 V6 Modifications CSS Styles and Themes How to identify the message already read?

I'm not a savvy on CSS, but by comparation I guess I found what you want me to do, but still nothing happens with the links I didn't read All still in the same "normal" font style.
See the lines I changed on FROSTED.CSS

.newlighttable {
color: #000000;
background-color: #e7f5fb;
font-weight: bold;
}
.newdarktable {
color: #000000;
background-color: #baeaf8;
font-weight: bold;
}
.newlighttable a:link {
font-weight: bold;
}
.newlighttable a:visited {
font-weight: normal;
}


Any more ideas?
Thank you for you help.