var W3CDOM = (document.createElement && document.getElementsByTagName);

function pokazUkryty(id){
  if (!W3CDOM) return;
  myRegEx1=/dol/;
  var cel = document.getElementById(id);
  var myDiv = document.getElementsByTagName("div");
  for(i=0;i<myDiv.length;i++){
    if(myDiv[i].className=='ukrytyDol'){
      myDiv[i].style.visibility = 'visible';
    }
    if(myDiv[i].className=='ukrytaGora'){
      myDiv[i].style.visibility = 'hidden';
    }
  }
  if(id.search(myRegEx1) == -1){
    //cel.style.visibility = 'hidden';
  }else{
    document.getElementById(id.replace('dol','gora')).style.visibility = 'visible';
  }
}