Using arrays to randomly select an object

Hi there,

I'm a newbie scripter and I'm trying to figure out how to have a script select a random object (say, every few seconds). I have 3 cylinders (let's call them Tube1, Tube2, Tube3, 1 of which will be randomly chosen through the script. I gather that this would be done through an array, but I haven't really gotten my head around how I would write this in js script, though I've been scouring the net for answers! I'm sure you guys could do this in your sleep - sorry for the stupid question :(

Thanks in advance - you guys really are the best!