/*
Spatna verze:

var prejizdime=false;

function hover(elm){
    if(prejizdime==false){
  var novy=document.createElement('div');
  novy.setAttribute('id',elm.id+"_overlay");
  novy.innerHTML=elm.title;
  novy.style.margin="10px";
  novy.style.backgroundImage="url('design/polocerne.png')";
  //novy.style.backgroundColor="black";
  novy.style.width="106px";          
  novy.style.height="106px";
  novy.style.position="absolute";     
  novy.style.top="0px";
  novy.onmouseout=function(){prejizdime=false;}         
  elm.appendChild(novy);
  prejizdime=true;
  }
}

function hoverOut(elm){
  if(prejizdime==false){
  elm.removeChild(document.getElementById(elm.id+"_overlay"));
  prejizdime=false;
  }
}

var i=1;
while (document.getElementById("nab"+i)){
 elm=document.getElementById("nab"+i);
  elm.onmouseover=function(){hover(this);};          
  elm.onmouseout=function(){hoverOut(this);};
 i++;
} 

*/


function hover(elm){
  if(elm.lastChild.style){
  elm.lastChild.style.visibility="visible";
 }
}
  
                                           
function hoverOut(elm){
  elm.lastChild.style.visibility="hidden";
}

var i=1;
while (document.getElementById("nab"+i)){
 elm=document.getElementById("nab"+i);
  
  var novy=document.createElement('div');
  novy.setAttribute('id',elm.id+"_overlay");
  novy.innerHTML=elm.title;
  novy.style.margin="10px";
  novy.style.backgroundImage="url('design/polocerne.png')";
  novy.style.width="106px";          
  novy.style.height="66px";
  novy.style.position="absolute";     
  novy.style.top="0px";
  novy.onmouseout=function(){prejizdime=false;}         
  novy.style.visibility="hidden";
  novy.style.paddingTop="40px";
  novy.style.fontSize="14px";
  novy.style.fontWeight="bold";
  novy.style.color="white";
  elm.appendChild(novy);

  elm.onmouseover=function(){hover(this);};  
  novy.onmouseover=function(){hover(this);};        
  elm.onmouseout=function(){hoverOut(this);};
 i++;
}