1var i, factor, 
2    duration = 250,
3    delayTime = 500;
4
5for (i = 2, factor = 0; i <= 4; i++, factor++) {
6    galleryAnimation(i, factor);
7}
8
9function galleryAnimation(i, factor) {
10    $("#pic" + i).delay(factor * delayTime).fadeIn(duration);
11}