function zobraz(id)
{
  if(document.getElementById(id))
	document.getElementById(id).style.display="block";
}
function zobraz_in(id)
{
  if(document.getElementById(id))
	 document.getElementById(id).style.display="inline";
}
function odzobraz(id)
{
  if(document.getElementById(id))
	document.getElementById(id).style.display="none";
}
function check_or_uncheck(id) {
  if(document.getElementById(id).checked == true)
    document.getElementById(id).checked = false;
  else
    document.getElementById(id).checked = 'checked';
}
function podbarvi(id,barva)
{
  if(document.getElementById(id))
	 document.getElementById(id).style.background=barva;
}
function odbarvi(id,barva)
{
  if(document.getElementById(id))
	document.getElementById(id).style.background=barva;
}



function posun_pozici(x) {
  document.getElementById('mapa').style.backgroundPosition = "0px -" + (x*146) + "px";
}

function posun_zpet() {
  document.getElementById('mapa').style.backgroundPosition = "0px 0px";
}

function odesli(formular) {
	document.getElementById(formular).submit();
}