interesting wireless question

so i'm sitting here on my powerbook and my only annoyance is that i have to manually select a network.

is there a setting or 3rd party program that will tell my mac to autoswitch to a stronger network? i have two routers where i live, because of the size of the building (actually i live and work at the same place), and when i go from one end to the other i have to manually switch connections. i would like for it to do it automatically.

program failed. i went from one end of the house to the other, it didnt auto switch.

bump, i also tried locamatic, it didnt work either.