well, that´s not so easy to answer...Bluetooth and WLAN use the same frequency range (2.400 to 2.4835 GHz in Europe), but of course both use different frequencies within this range, also the protocols are totally different.
I've heard of a program called "Bluetooth-WLAN-Connect", but as far as I´ve read in different phreak-boards it don´t work.
in theory it is possible to connect, but you would need a program which converts the protocols on the PDA, because a WLAN router only "understands" the WLAN protocols.
