function ajax(stranka, kam)
{

    var httpRequest;
    
    if(typeof window.ActiveXObject != 'undefined')
    {
        httpRequest = new ActiveXObject("Microsoft.XMLHTTP");
    }
    else
    {  
        httpRequest = new XMLHttpRequest();
    }
    httpRequest.open("GET", stranka, true);
    httpRequest.onreadystatechange= function () 
    {
        processRequest(httpRequest, kam) 
    };
    httpRequest.send(null);
}


function processRequest(httpRequest, kam) 
{
    if (httpRequest.readyState == 4)
    {
        if(httpRequest.status == 200)
        {
            if (typeof kam == 'string') 
            {
                document.getElementById(kam).innerHTML = httpRequest.responseText;
            }
            if (typeof kam == 'function') 
            {
                kam(httpRequest.responseText);
            }
        }
        else
        {
            alert("Chyba pri nacitani stanky " + httpRequest.status +" : "+ httpRequest.statusText);
        }
    }
    else
    {
        if (typeof kam == 'string' && kam != '') 
        {
            document.getElementById(kam).innerHTML = '<center><Br><br><br><img src="loader.gif"></center>';

          
        }
    }
       
} 

function zmen(a)
 {
 
 document.getElementById('z2').style.background='url(images/topt2.png)';
 document.getElementById('z3').style.background='url(images/topt2.png)';
 document.getElementById('z4').style.background='url(images/topt2.png)';
 document.getElementById('z5').style.background='url(images/topt2.png)';
 
 if (a==1) 
 {
 document.getElementById('z1').style.background='url(images/topt.png)';
 } else 
 {
  document.getElementById('z1').style.background='url(images/topt4.png)';
   document.getElementById('z'+a).style.background='url(images/topt3.png)';

 }
 
 }
 
 var TimeToFade = 250.0;
 function fade(eid)
{
  var element = document.getElementById(eid);
  if(element == null)
    return;
   
  if(element.FadeState == null)
  {
    if(element.style.opacity == null
        || element.style.opacity == ''
        || element.style.opacity == '0.99')
    {
      element.FadeState = -2;
    }
    else
    {
      element.FadeState = 2;
    }
  }
   
  if(element.FadeState == 1 || element.FadeState == -1)
  {
    element.FadeState = element.FadeState == 1 ? -1 : 1;
    element.FadeTimeLeft = TimeToFade - element.FadeTimeLeft;
  }
  else
  {
    element.FadeState = element.FadeState == 2 ? -1 : 1;
    element.FadeTimeLeft = TimeToFade;
    element.style.display = element.FadeState == 2
        ? 'none' : 'block';
    setTimeout("animateFade(" + new Date().getTime()
        + ",'" + eid + "')", 33);
  }
}

function animateFade(lastTick, eid)
{
  var curTick = new Date().getTime();
  var elapsedTicks = curTick - lastTick;
 
  var element = document.getElementById(eid);
 
  if(element.FadeTimeLeft <= elapsedTicks)
  {
   element.style.display = element.FadeState == 1
        ? 'block' : 'none';
    element.style.opacity = element.FadeState == 1
        ? '.99' : '0';
    element.style.filter = 'alpha(opacity = '
        + (element.FadeState == 1 ? '99' : '0') + ')';
    element.FadeState = element.FadeState == 1 ? 2 : -2;
    return;
  }
 
  element.FadeTimeLeft -= elapsedTicks;
  var newOpVal = element.FadeTimeLeft/TimeToFade;
  if(element.FadeState == 1)
    newOpVal = 1 - newOpVal;

  newOpVal = newOpVal*0.99;
  element.style.opacity = newOpVal;
  element.style.filter =
      'alpha(opacity = ' + (newOpVal*100) + ')';
 
  setTimeout("animateFade(" + curTick
      + ",'" + eid + "')", 33);
}

var rp=1;
var cyklus=1;

function reklama()
 {
 var filename='rotate'+rp;
 if (cyklus==2) { cyklus=0; rp++};
 fade(filename);
 if (cyklus==1) setTimeout("reklama();",4000); else setTimeout("reklama();",500);
 cyklus++;
 if ((cyklus==1) & (rp==4)) { cyklus=1; rp=1;}
 
 


 }



function show(a) 
{
 

   document.getElementById('ponuka1').style.display='none';
   document.getElementById('ponuka2').style.display='none';
   document.getElementById('ponuka3').style.display='none';
    
   
   fade('ponuka'+a);

}

function unshow()
{

   document.getElementById('ponuka1').style.display='none';
   document.getElementById('ponuka2').style.display='none';
   document.getElementById('ponuka3').style.display='none';
   

}