function showLayer(layerName){
hideAll();
obj = document.getElementById(layerName);
obj.style.display = "block";
}
function hideLayer(layerName){
obj=document.getElementById(layerName);
obj.style.display = "none";
}
function hideAll(){
if (document.getElementById('dolnoslaskie') != null) hideLayer('dolnoslaskie');
if (document.getElementById('kujawskopomorskie') != null) hideLayer('kujawskopomorskie');
if (document.getElementById('lubelskie') != null) hideLayer('lubelskie');
if (document.getElementById('lubuskie') != null) hideLayer('lubuskie');
if (document.getElementById('lodzkie') != null) hideLayer('lodzkie');
if (document.getElementById('malopolskie') != null)	hideLayer('malopolskie');
if (document.getElementById('mazowieckie') != null)	hideLayer('mazowieckie');
if (document.getElementById('opolskie') != null) hideLayer('opolskie');
if (document.getElementById('podkarpackie') != null) hideLayer('podkarpackie');
if (document.getElementById('podlaskie') != null) hideLayer('podlaskie');
if (document.getElementById('pomorskie') != null) hideLayer('pomorskie');
if (document.getElementById('slaskie') != null) hideLayer('slaskie');
if (document.getElementById('swietokrzyskie') != null) hideLayer('swietokrzyskie');
if (document.getElementById('warminskomazurskie') != null) hideLayer('warminskomazurskie');
if (document.getElementById('wielkopolskie') != null) hideLayer('wielkopolskie');
if (document.getElementById('zachodniopomorskie') != null) hideLayer('zachodniopomorskie');
}