I think the GTS nuker might do what you want, but I am unsure. (I have not actually tried any of this, as the wireless I use uses WPA instead of WEP)
http://projectpokemon.org/forums/showthread.php?780-GTS-website-research&p=71061&viewfull=1#post71061
EDIT: also, I think the one I linked too is for if it is on your network, and no over the internet
(this is my first post)