JQuery :: How To Make Loop Wait For Event

I'm trying to make a list of tweets fade in and out progressively down the list. I'm pretty new to javascript and jquery, so I might be missing out on some basics.

1. How do I make the while loop infinite and loop around itself, because I'd like the tweets to loop around when it reaches the last tweet. I tried adding the if statement to make it go back to 0 but it hangs my page when I include it.
2. How do I make the loop not run altogether at once? I've tried queue() and putting in delay(4000) right before the .eq(n) so that it delays 4000ms before selecting the next tweet, but I'm trying to find a more elegant solution to it as the timing might be offset infinitely if there are changes in the timings.

var $j = jQuery.noConflict();
$j(document).ready(function() {
var tweet = $j('#twitter-3 .tweets li').length;
var n = 0;
while (n <= tweet) {
$j('#twitter-3 .tweets li').eq(n).delay(500).fadeIn(1000).delay(2000).fadeOut(500);
n++;
//if (n == tweet) {
// n = 0;
//};
};});