function ap_getObj(name) {
  if (document.getElementById) 
    return document.getElementById(name).style;
  else
    if (document.all) 
      return document.all[name].style;
    else
      if (document.layers) 
        return document.layers[name];
}

jestisknuto=false;

function Hlavicka_onMouseDown()
{
 jestisknuto=true;
}

function PohybMysi(e){
 if (jestisknuto)
  {
   if (navigator.appName=="Microsoft Internet Explorer" || navigator.appName=="Opera")
    {
     document.getElementById("tabulka").style.left=window.event.x-100;
     document.getElementById("tabulka").style.top=window.event.y-15;
    }

   if (navigator.appName=="Netscape")
    {
     document.getElementById("tabulka").style.left=e.pageX-100;
     document.getElementById("tabulka").style.top=e.pageY-15;
    }
  }
}

function UkonceniPresunu(){
jestisknuto=false;
if(document.getElementById("tabulka").style.left < "0" && document.getElementById("tabulka").style.left != "")
    document.getElementById("tabulka").style.left = 0;
if(document.getElementById("tabulka").style.top < "0" && document.getElementById("tabulka").style.top != "")
    document.getElementById("tabulka").style.top = 0;
}

function SkryjTabulku(){
 document.getElementById('tabulka').style.visibility='hidden';
}

function ZobrazTabulku(){
 document.getElementById('tabulka').style.visibility='visible';
 return false;
}

function priradfunkce(){

var x = ap_getObj('tabulka');

document.onmouseup = UkonceniPresunu;
document.onmousemove = PohybMysi;
document.getElementById("ukaz").onclick = ZobrazTabulku;
document.getElementById("hlavicka").onmousedown = Hlavicka_onMouseDown;
document.getElementById("kriz").onclick = SkryjTabulku;
}