function zobraz($a,$b)
{    var a
     //var url = document.getElementById("vyber").value;
      var url=$a;
      var element=$b;
 
     if (url != 0)
     {
        if (window.ActiveXObject)
        {
          httpRequest = new ActiveXObject("Microsoft.XMLHTTP");
        }
        else
        {
          httpRequest = new XMLHttpRequest();
        }
        httpRequest.open("GET", url, true);
        httpRequest.onreadystatechange= function () {processRequest(element); } ;
        httpRequest.send(null);
      }
      else
      {

        document.getElementById(element).innerHTML = "bug";
        
      }
}




//funkce pro zobrazovani pres ajax
function processRequest($b)
{var element=$b;
  if (httpRequest.readyState == 4)
  {
    if(httpRequest.status == 200)
    {
     var mistoZobrazeni = document.getElementById(element);
       
              
   //alert (element);
       document.getElementById(element).innerHTML = '';
       
      mistoZobrazeni.innerHTML = httpRequest.responseText;
      //mistoZobrazeni.style.visibility='visible';
       //myLightbox = new Lightbox();
		
    }
    else
    {
        alert("Chyba pri nacitani stanky"+ httpRequest.status +":"+ httpRequest.statusText);
    }
  }
}


function ukaz(cislo){
	var cislo//cislo textu
	var idecko='ajax';
	var cesta='./txt/u_optika/texty.php?pz=';
	var adresa=cesta+cislo;
	
	zobraz(adresa,idecko);//ajax fce
	

}