app.js

function scroll(direction) {

 var newsHeight = ($('#home_news_list').height());
   var newsContainerHeight = 190;
  
 if (direction == "up"){
  topVal += increment; 
  if (topVal > 0){
   topVal = 0; 
   var stop = true;
  }
 }
 else {
  topVal -= increment;
  if (topVal + newsHeight < newsContainerHeight) {
   var stop = true;
  }
 }
 if (!stop){
  $('#home_news_list').animate({'top': topVal + 'px'},5);
  scrolldelay = setTimeout('scroll(\''+direction+'\')',5); // scrolls every 5ms
 }
}