window.addEvent('domready', function() {
    var iCurrentScroll = 0;
    var iScrollCount = 3;

    var scrollWrapItems = $$('#scrollWrap ul li');
    var scroll = new Fx.Scroll('scroll', {
        duration: 300,
        wait: false
    });

    $('scrollButtonTop').addEvent('click', function(){
        if(iCurrentScroll != 0)
        {
            iCurrentScroll = iCurrentScroll - 1;
        }
        else
        {
            iCurrentScroll = scrollWrapItems.length - iScrollCount;
        }
        scroll.toElement(scrollWrapItems[iCurrentScroll]);
    });
    
    $('scrollButtonBottom').addEvent('click', function(){
        if(iCurrentScroll < scrollWrapItems.length - iScrollCount)
        {
            iCurrentScroll = iCurrentScroll + 1;
        }
        else
        {
            iCurrentScroll = 0;
        }
        scroll.toElement(scrollWrapItems[iCurrentScroll]);
    });
});