// Config
var diashow_elements_offsetbottom = 10;
var diashow_scroll_speed = 50;
var diashow_waitfor_changespeed = 2000;

// Do NOT change
var diashow_element = null;
var diashow_scroll_direction = 1;
var diashow_lastscroll = -1;
var diashow_stopped = false;


function diashow_init() {

    diashow_element = document.getElementById('diashow');

    start_diashow();
}


function start_diashow() {

    if (!diashow_stopped) {

        var diashow_newscroll = parseInt(diashow_element.scrollTop) + diashow_scroll_direction;
        diashow_element.scrollTop = diashow_newscroll;

        if (diashow_lastscroll == diashow_newscroll) {

            diashow_scroll_direction *= -1;
            diashow_stopped = true;

            setTimeout('diashow_stopped=false', diashow_waitfor_changespeed);
        }
        diashow_lastscroll = diashow_newscroll;
    }

    setTimeout('start_diashow()', diashow_scroll_speed);
}