function zobraz_nav(idecko)
  {
    el=document.getElementById(idecko).style; 
    el.display='block';
  }

function skryj_nav(idecko)
  {
    el=document.getElementById(idecko).style; 
    el.display='none';
  }


_news_viewed = null;

function news_init()
{
    document.getElementById('news_img_0').style.display = 'block';
    _news_viewed = 'news_img_0';
}

function set_new(id)
{
    document.getElementById(_news_viewed).style.display = 'none';
    document.getElementById(id).style.display = 'block';
    _news_viewed = id;
}