im not to sure, but why not give it a shot if your desperate. as i havent used the newer gl versions im not too sure about this, but earlier there was something in my header for "welcome (if username logged in command print username)" so.. lets say that username logged in status variable is $uname_status, then give a go for
if($uname_status!=NULL) or if($uname_status!='')
or something like that
{ then print the online buttons.}
then offcourse: else{offline buttons}
check your gl header for the uname_status thingie and then u should be able to work it out within short time..
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Fraggalot