scroller_position = 0;

$(document).ready(function(){ 
    scroll_width = document.getElementById('scroller_inside').style.width;
    scroll_width = scroll_width.replace("px","");
    scroll_width = 400+88 - scroll_width;
});

function moveToPrevious()
{
    if (scroller_position == 0) { return; } 
    scroller_position = scroller_position+88;
    new Effect.Move('scroller_inside', { x: 88, y: 0, transition: Effect.Transitions.sinoidal });
}

function moveToNext()
{
    if (scroller_position <= scroll_width) { return; } 
    scroller_position = scroller_position-88;
    new Effect.Move('scroller_inside', { x: -88, y: 0, transition: Effect.Transitions.sinoidal });
}