function switchChunk( chunk_id ){
  if (chunk_id != last_id) {
    elem = document.getElementById(chunk_id);
    elem.style.display = 'inline';
    elem = document.getElementById('pager' + chunk_id);
    elem.className = 'selected';

    elem = document.getElementById(last_id);
    elem.style.display = 'none';
    elem = document.getElementById('pager' + last_id);
    elem.className = '';

    last_id = chunk_id;
  }
}

function readCookie(name) {
    var nameEQ = name + "=";
    var ca = document.cookie.split(';');
    for(var i=0;i < ca.length;i++) {
	var c = ca[i];
	while (c.charAt(0)==' ') c = c.substring(1,c.length);
	if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
    }
    return null;
}

function changeView() {
    var view = readCookie('view');
    if ((view == 0) || (view == null)) {
      elem = document.getElementById(last_id);
      elem.style.display = 'inline';
      elem = document.getElementById('klappe');
      elem.style.display = 'inline';
      elem = document.getElementById('viewlistclose');
      elem.style.display = 'inline';
      elem = document.getElementById('viewlistopen');
      elem.style.display = 'none';
      elem = document.getElementById('viewswitch');
      elem.className = 'closelist';
      document.cookie = "view=1";
    } else {
      if (last_id == '') {
        last_id = 0;
      }
      elem = document.getElementById(last_id);
      elem.style.display = 'none';
      elem = document.getElementById('klappe');
      elem.style.display = 'none';
      elem = document.getElementById('viewlistclose');
      elem.style.display = 'none';
      elem = document.getElementById('viewlistopen');
      elem.style.display = 'inline';
      elem = document.getElementById('viewswitch');
      elem.className = 'openlist';
      document.cookie = "view=0";
    }
}