Use a timer and send a different key on each click. That would be the way to get the interval in there. Look up SendKeys for the key presses....maybe. Actually, after reading what Joshlad suggested, it does occur to me that there could be multiple ways to read that question. I was thinking that your goal was to send keys presses to some other program, but that isn't necessarily the case. Perhaps a bit more description would be good.

EDIT: Wow, I think I need to refresh my browser faster. You had it solved before I even started writing.