ho fatto cosi:

if(ismod($uid)) $addClass = " Blued";
if(!sowner(getuid_sid($sid))) $addClass = " Greened";
if(isheadadmin(getuid_sid($sid))) $addClass = " Yellowed";
if(isadmin(getuid_sid($sid))) $addClass = " Redded";

echo "<span class=\"time\">[$ds]</span><a href=\"chat.php?action=say2&amp;sid=$sid&amp;who=$ chat[0]&amp;rid=$rid&amp;rpw=$rpw\"><span class=\"$addClass\">$optlink</span></a> - ";


e nel css ho messo:

.Blued{
color: #0000A0;
background-color: #E0FFFF;
}
.Redded{
color: #C11B17;
background-color: #F9966B;
}
.Yellowed{
color: #AF7817;
background-color: #FFF380;
}
.Greened{
color: #254117;
background-color: #6AFB92;
}
.nickname{color: deepskyblue;}

ma non funziona...e non capisco perchè...