function showBlock(blockId)
  {
    if(document.getElementById(blockId).style.display=="block") {
	document.getElementById(blockId).style.display = "none";
    } else {
	document.getElementById(blockId).style.display = "block";
    }
  }
  function hideBlock(blockId)
  {
    if(document.getElementById(blockId).style.display=="none") {
	document.getElementById(blockId).style.display = "block";
    } else {
	document.getElementById(blockId).style.display = "none";
    }
  }
  function nastavCookies() {
    var vyprs=new Date();
    vyprs.setDate(vyprs.getDate() - 1);
    document.cookie="rozsirene=false; expires="+vyprs.toGMTString()+";";
    vyprs.setDate(1 + 1 + vyprs.getDate());
    document.cookie="rozsirene=false; expires="+vyprs.toGMTString()+";";
  }
  function smazCookies() {
    var vyprs=new Date();
    vyprs.setDate(vyprs.getDate() - 1);
    document.cookie="rozsirene=false; expires="+vyprs.toGMTString()+";";
  }
  function bookmarksite(title,url) {
    if (window.sidebar) // firefox
	window.sidebar.addPanel(title, url, "");
    else if(window.opera && window.print) { // opera
	var elem = document.createElement('a');
	elem.setAttribute('href',url);
	elem.setAttribute('title',title);
	elem.setAttribute('rel','sidebar');
	elem.click();
    } 
    else if(document.all)// ie
	window.external.AddFavorite(url, title);
  }