// JavaScript Document
var xmlHttp

function refreshContent()
{
 
xmlHttp=GetXmlHttpObject();
if (xmlHttp==null)
  {
  alert ("Your browser does not support AJAX!");
  return;
  } 

 
var fid =  document.getElementById('fid1').innerHTML; 
var cat =  document.getElementById('cat1').innerHTML;
var niv = document.getElementById('niv1').innerHTML;
var bukva = document.getElementById('bukva1').innerHTML;


var url="refresh_content.php";
url=url+"?fid="+fid+"&cat="+cat+"&niv="+niv+"&bukva="+bukva;
//url=url+"?fid="+fid+'&cat='+cat+'&niv='+niv+'&bukva='+bukva;

url=url+"&sid="+Math.random();
xmlHttp.onreadystatechange=stateChanged1;
xmlHttp.open("GET",url,true);
xmlHttp.send(null);

return true;
} 

function stateChanged1() 
{ 
if (xmlHttp.readyState==4)
{ 
document.getElementById("mycontent").innerHTML=xmlHttp.responseText;
return true;
}
return false;
}


 

function GetXmlHttpObject()
{
var xmlHttp=null;
try
  {
  // Firefox, Opera 8.0+, Safari
  xmlHttp=new XMLHttpRequest();
  }
catch (e)
  {
  // Internet Explorer
  try
    {
    xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
    }
  catch (e)
    {
    xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
    }
  }
return xmlHttp;
}