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window.onload=function(){

var autoplay=document.getElementById('div_autoplay');

var list=document.getElementById('list');

var buttons=document.getElementById('buttons').getElementByTagName('span');

var prev=document.getElementById('prev');

var next=document.getElementById('next');

function animate(offset){

list.style.left=parseInt(list.style.left)+offset+'px';

if(list.style.left>-800){

list.style.left=-4000+'px';

}

if(list.style.left<-4000){

list.style.left=-800+'px';

}

}

next.onclick = function(){

animate(-800);

}

prev.onclick = function(){

animate(800);

}

}

</script>