function ajax_search(text) {
 var xmlhttp;
try {
  xmlhttp = new XMLHttpRequest();
}
catch (e) {
 try {
  xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
 }
 catch (e) {
  try {
     xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
  }
 catch (e) {
     alert("Váš prohlížeč nepodporuje AJAX!");
   return false;
 }
}
}
var url = '/ajax/ajax_search.php?search=' + text;
xmlhttp.onreadystatechange = function() {
 if(xmlhttp.readyState == 4) {
   document.getElementById('vysledek').innerHTML = xmlhttp.responseText;
}
}
xmlhttp.open("GET", url, true);
xmlhttp.send(null);
}