function tabswitch(whichtab, whichcontent) {
document.getElementById('box_content_1').style.display =
document.getElementById('box_content_2').style.display =
document.getElementById('box_content_3').style.display =
document.getElementById('box_content_4').style.display = 'none';
document.getElementById(whichcontent).style.display = 'block';

document.getElementById('tab1').className =
document.getElementById('tab2').className =
document.getElementById('tab3').className =
document.getElementById('tab4').className = 'off';
document.getElementById(whichtab).className = 'on';
}



onload = function(){
  if(!Get_Cookie('start')) {

    var today = new Date();
    var zero_date = new Date(0,0,0);
    today.setTime(today.getTime() - zero_date.getTime());
    var expire = new Date(today.getTime() + (8 * 7 * 86400000));

    Set_Cookie('start','1',expire,'/');

    var mobiInfo = document.createElement('div');

    mobiInfo.style.position = 'absolute';
    mobiInfo.style.width = '100%';
    mobiInfo.style.height = '25px';
    mobiInfo.style.top = '0px';
    mobiInfo.style.left = '0px';
    mobiInfo.style.margin = '0'
    mobiInfo.style.backgroundColor = '#222';
    mobiInfo.style.textAlign = 'center';

    mobiInfo.innerHTML = '<p style="margin: 0; color: #fff;">Zum ersten Mal hier? Im <a href="http://spreelichter.info/blog">Blog</a> findest Du t&auml;glich aktualisierte Beitr&auml;ge.</p>';

    document.body.insertBefore(mobiInfo, document.getElementById("container_main"));
    document.getElementById("container_main").style.marginTop = '42px';
  }
}


/*
onload = function(){
  document.body.insertBefore(mobiInfo, document.getElementById("container_main"));
  document.getElementById("container_main").style.marginTop = '42px';
}

*/