var ie=(document.all)?true:false;

function poruszanie(e){

  if(ie == true)
  {
   Iks = event.clientX + document.body.scrollLeft + 12;
   Igrek = event.clientY + document.body.scrollTop + 12;
  }
  else
  {
   Iks = e.pageX + 12;
   Igrek = e.pageY + 12;
  }
  
document.getElementById('tooltip').style.top = Igrek;
document.getElementById('tooltip').style.left = Iks;
}

if (document.captureEvents) document.captureEvents(Event.MOUSEMOVE);
document.onmousemove = poruszanie;

function tooltip(tekst, co){
document.getElementById('tooltip').innerHTML = tekst;
document.getElementById('tooltip').style.display = co;
}