amazing....i posted this riddle 2 years ago on my homepage and even today i receive emails with possible solutions.

but i have another interesting riddle:
you have two rooms, in the first room there is a bulb and in the second there are three power buttons. One of these buttons is connected with the bulb. you can switch the buttons as much as you want but you are only allowed to go one time to the other room to look whether the bulb is on or off.
how do you get the right power button?

good luck