$(function(){
 $('#scroller-up').click(function(){
  scroll(-1);
  return false;
 });
 $('#scroller-down').click(function(){
  scroll(1);
  return false;
 });
    
 $('#scroller-up').mousedown(function(){
  amountG = -1;
  interval = window.setInterval(
   scrollCont,
   tick
  );
 });

 $('#scroller-up').mouseup(function(){
  window.clearInterval(interval);
 });

 $('#scroller-down').mousedown(function(){
  amountG = 1;
  interval = window.setInterval(
   scrollCont,
   tick
  );
 });

 $('#scroller-down').mouseup(function(){
  window.clearInterval(interval);
 });
});

function scroll(amount)
{
 var s = $('#scroller').get()[0];
 s.scrollTop += amount * 10;
}

var interval;
var amountG = 1;
var tick = 200;

function scrollCont()
{
 scroll(amountG); 
}