function fnStartFlip(){
    setTimeout('fnFlipImage();',5000);
}

function fnFlipImage(){
    var intSlideID = getActiveImage();
    var intNumberOfSlides = $$('img.page-image').length;
    
    intSlideID++;
    if (intSlideID > intNumberOfSlides){ intSlideID = 1; }
    
    var objSlideFX = new Fx.Tween($$('img.page-image')[((intSlideID == 1) ? intNumberOfSlides-1 : (intSlideID-2))], {duration: 'long'});
    objSlideFX.start('opacity', 1, 0);
    
    var objSlideFX = new Fx.Tween($$('img.page-image')[intSlideID-1], {duration: 'long'});
    objSlideFX.start('opacity', 0, 1);
    
    setTimeout('fnFlipImage()', 5000);
}

function getActiveImage(){
    var intReturn = 0;
    
    for (i = 0;i < $$('img.page-image').length-1; i++){
        if ($$('img.page-image')[i].style.visibility == 'visible'){
            intReturn = (i+1);
        }
    }
    
    return intReturn;
}