function showBlock(id) {
  if (document.getElementById(id).className == "hidden") {
    document.getElementById(id).className="";
    document.getElementById("firma").checked=true;
    return false
  }
  if (document.getElementById(id).className != "hidden") {
    document.getElementById("firma").checked=false;
    document.getElementById(id).className="hidden";
    return false
  }
}
function showSpecialText(id) {
  
  if (document.getElementById('special').value == 1) {
    document.getElementById(id).className="";
    return false
  }
  if (document.getElementById('special').value != 1) {
    document.getElementById(id).className="hidden";
    return false
  }
}

function showForm(id) {
  if (document.getElementById(id).className == "hidden") {
    document.getElementById(id).className="";
    return false
  }
}

function spocitejCenu(co) {
    document.getElementById("total").value +=co;
    return false
}

function addTransport(id) {
  if (document.getElementById(id).className == "hidden") {
    document.getElementById(id).className="";
    return false
  }
}
function addbookmark(url){
 title = "Zdravá výživa"; 
	if (window.sidebar) { // Mozilla Firefox Bookmark
		window.sidebar.addPanel(title, url,"");
	} else if( window.external ) { // IE Favorite
		window.external.AddFavorite( url, title); }
	else if(window.opera && window.print) { // Opera Hotlist
		return true; }
}