same icon in popup event Contact Online than the Contact have in the roster (i mean transport icon if this contact is a transported one)
In add with this ticket http://trac.gajim.org/ticket/1246 , instead of the bubbleman 48x48 icon it will be more coherent if the icon that appear in the Contact Online popup notification is the one Contact have in the roster. If this contact is Jabber, use the Jabber one (Bubbleman default, maybe it should use iconset in the future), if this contact is Jabber-transported one (Msn,Icq,...), use the Msn,Icq,... one (in this case we need 48x48 resized transports icons, but we already have svg of theses).