function newsletter() {
    if (document.newsform.email.value != '')
        document.newsform.submit();
    else
        alert('Geben Sie bitte Ihre E-Mail Adresse ein.')
    return false;
}


function getObj(objName) {
    if (document.getElementById && document.getElementById(objName) != null)
        return document.getElementById(objName);
    else if (document.all)
        return document.all[objName];
    else
        return null;
}


var opacity = 0;
var dopacity = 4;
var mqinterval = null;


function showMoreNews() {
    opacity += dopacity + 1;
    dopacity /= 1.1;

    if (newsobj.style.opacity != null)
        newsobj.style.opacity = opacity / 100;
    if (newsobj.style.filter != null)
        newsobj.style.filter = 'alpha(opacity=' + opacity + ')';
    if (opacity >= 93) {
        clearInterval(mqinterval);
        setVisibility(closeobj, 'visible');
    }
}


function setVisibility(obj, value) {
    if (obj != null)
        obj.style.visibility = value;
}


function initObjects() {
    newsobj = getObj('newsdiv');
    closeobj = getObj('close');
    buchdivobj = getObj('buchdiv');
    buchdivbgobj = getObj('buchdivbg');
}


function hideNews() {
    initObjects();

    setVisibility(newsobj, 'hidden');
    setVisibility(closeobj, 'hidden');
    setVisibility(buchdivobj, 'visible');
    setVisibility(buchdivbgobj, 'visible');

    if (mqinterval != null)
        clearInterval(mqinterval);
}


function showNewsReally() {
    initObjects();

    if (newsobj == null || closeobj == null)
        return;

    setVisibility(buchdivobj, 'hidden');
    setVisibility(buchdivbgobj, 'hidden');
    setVisibility(newsobj, 'visible');

    mqinterval = setInterval('showMoreNews()', 15);
}


function showNews() {
    mqinterval = setTimeout('showNewsReally()', 2000);
}