You will have to use a variable to do what you want, you just can't use loopindex with a wait.
the Wait will not "pause" the loop. The loop will continue to run normaly at max CPU speed and finish instantly.
2 seconds after, when your first "wait" countdown is finished, the loop already finished 2 seconds ago (instantly) and the loopindex will be null so you can't use it
Here is a screenshot of what i understood you wanted, i'm using a variable instead of the loopindex
<img src="https://dl.dropbox.com/u/5129970/constructforum/eventcapture.jpg" border="0" />
the green sprite have 3 image point at different positions