found the reference TSB EL010-07 (revised Nov 9th 2007)
http://www.scribd.com/doc/9766159/TSEL01007
it states that camry models 1998-1999 were equipped with RS3000 VIP alarm system compatible with gray FOBs (black ones won't work work with it). it's exactly the same alarm model and FOB model as my 2000 Solara uses.
camry models dated 2000-2006 use RS3200 alarm system.
you can get the FOB (remote) from ebay, they are used:
http://shop.ebay.com/i.html?_nkw=BAB...sacat=0&bkBtn=
Programming instructions are trivial. once you find ECU you have to press the magical green button on it and then you have 5 seconds to press the top button on FOB to make it registered in ECU memory. that's it.
I'm unsure about location of alarm ECU on camry, probably as stated above it's behind the driver knee panel or something. on my Solara it was under center arm rest, but that's a different car. highlanders have it under the driver seat for example, so it varies between models.
user manual for RS3000 here:
http://www.parksoffroad.com/tacomamo.../alarminfo.htm
and here:
http://www.4runners.org/writeups/rs3000/index.html
good luck!