/* Copyright (c) 2003-2008 Tomáš Andresek, www.ndesign.cz */


var id, 
    op = 100,       // poten prhlednost
    step = -10;     // krok

function Start()
{
    id = window.setInterval("Move()", 250); 
}

function Stop()
{
    window.clearInterval(id);
}

function Move()
{
    op += step;

    if (op < 0) {
        op = 0;
        step = -step;
        };

    if (op > 100) {
        op = 100;
        step = -step;
        };

document.all.img1.filters.Alpha.opacity = op;
document.all.img2.filters.Alpha.opacity = 100-op;
}