var scrollId;
$(document).ready(function(){  
  $('.scrollBox td').click(function(){
    $('.scrollBox td.selected').toggleClass('selected');
    $(this).toggleClass('selected');
    if($(this).attr("iter") == 0) {
      clearInterval(scrollId);
    }
    else {
      clearInterval(scrollId);
      scrollId = setInterval('scrollDown();', $(this).attr("iter"));
    }
  });
  $('.scrollBox').draggable();
});

function scrollDown() {
  $.scrollTo("+=20px", 100);
}