def lookup_server(self, server, tab):
"""
This method performs a lookup of a certain server. Its like a search
with the adress as paremeter so it clears the serverlist on the
requesting tab and only adds the server object with the looked up
data to the list afterwards.
@param server - the server to be looked up
@param tab - the requesting tab
"""
#clear the serverlist on the tab
tab.serverlist.clear()
#start the lookup in an extra thread using the querymanager
qm = QueryManager()
qm.lookup_server(server, tab)
