function showOrHide(divId,onshow,onhide) {
    var d = $(divId);
    if (d.style.display == 'none') {
        new Effect.Appear(d);
        if (onshow) onshow();
    } else {
        new Effect.Fade(d);
        if (onhide) onhide();
    }
 
}

function showOrHideNoEffect(divId,onshow,onhide) {
    var d = $(divId);
    if (d.style.display == 'none') {
        d.style.display = 'block';
        d.style.visibility = 'visible';
        if (onshow) onshow();
    } else {
        d.style.display = 'none';
        d.style.visibility = 'hidden';
        if (onhide) onhide();
    }
}