function enableTooltips(id){
  
  var links,i,h;
  if(!document.getElementById || !document.getElementsByTagName) 
    return;
  
  //AddCss();
  
  h=document.createElement("span");
  h.id="btc";
  h.setAttribute("id","btc");
  h.style.position="absolute";
  
  document.getElementsByTagName("body")[0].appendChild(h);
  
  if(id==null) 
    links=document.getElementsByTagName("a");
  else 
    links=document.getElementById(id).getElementsByTagName("a");
  
  for(i=0;i<links.length;i++){
    Prepare(links[i]);
  }
}

function Prepare(el){
  var tooltip,t,b,s,l;
  tooltip=CreateEl("span","tooltip");
  
  img = document.createElement('img');
  img.src = "https://www.wiera.hu/images/njoy.png";
  
  tooltip.appendChild(img);
 
  setOpacity(tooltip);
  el.tooltip=tooltip;
  el.onmouseover=showTooltip;
  el.onmouseout=hideTooltip;
  el.onmousemove=Locate;
}

function showTooltip(e){
  document.getElementById("btc").appendChild(this.tooltip);
  Locate(e);
}

function hideTooltip(e){
  var d=document.getElementById("btc");
  if(d.childNodes.length>0) d.removeChild(d.firstChild);
}

function setOpacity(el){
  el.style.filter="alpha(opacity:95)";
  el.style.KHTMLOpacity="0.95";
  el.style.MozOpacity="0.95";
  el.style.opacity="0.95";
}

function CreateEl(t,c){
  var x=document.createElement(t);
  x.className=c;
  x.style.display="block";
  return(x);
}

function AddCss(){
  var l=CreateEl("link");
  l.setAttribute("type","text/css");
  l.setAttribute("rel","stylesheet");
  l.setAttribute("href","bt.css");
  l.setAttribute("media","screen");
  document.getElementsByTagName("head")[0].appendChild(l);
}

function Locate(e){
  var posx=0,posy=0;
  if(e==null) e=window.event;
  if(e.pageX || e.pageY){
      posx=e.pageX; posy=e.pageY;
      }
  else if(e.clientX || e.clientY){
      if(document.documentElement.scrollTop){
          posx=e.clientX-document.documentElement.scrollLeft;
          posy=e.clientY-document.documentElement.scrollTop;
          }
      else{
          posx=e.clientX-document.body.scrollLeft;
          posy=e.clientY-document.body.scrollTop;
          }
      }
  document.getElementById("btc").style.top=(posy-160)+"px";
  document.getElementById("btc").style.left=(posx-20)+"px";
}