Different button links

  
for (i=0; i<picnum; i++) {
var pict = pic.duplicateMovieClip("pic"+i, this.getNextHighestDepth());
pict.loadMovie("thumbs/"+i+".jpg");
btn.duplicateMovieClip("btn"+i+"", this.getNextHighestDepth());
}

how can i assign different button links that i duplicated above?