function AjaxSend(text,tagid) {
  var ajax = (window.XMLHttpRequest ? new XMLHttpRequest() : (window.ActiveXObject ? new ActiveXObject("Microsoft.XMLHTTP") : false));
  // if(!ajax){ alert("XMLHttpRequest Error!"); return true; }
  ajax.onreadystatechange= function () { AjaxMake(ajax,tagid); }
  ajax.open("GET", js_ADIR+"/index.php?"+js_WEBGET+"="+js_introduction+"&lng="+js_lang+"&adr="+js_ADIR+"&show="+text, true);
  ajax.send(null);
  return false;
}

function AjaxMake(ajax,tagid) {
  var txt;
  if (ajax.readyState == 4) { // odpoved OK
    if(ajax.status == 200 || ajax.status==0) { txt=ajax.responseText; document.getElementById(tagid).innerHTML=txt; }
    else { alert("Error: "+ ajax.status +":"+ ajax.statusText); }
  }
}

function CHclass(a,b,c) {
  for(i=1;i<15;i++) {
    var pomocna1 = document.getElementById("submenu1_"+i);
    if (pomocna1) { pomocna1.style.background = "url("+js_ADIR+"/submenu_4.jpg) repeat-x"; }
    var pomocna2 = document.getElementById("submenu2_"+i);
    if (pomocna2) { document.getElementById("submenu2_"+i).style.background = "url("+js_ADIR+"/submenu_5.jpg) repeat-x"; document.getElementById("submenu2_"+i).style.fontWeight = "normal"; }
    var pomocna3 = document.getElementById("submenu3_"+i);
    if (pomocna3) { document.getElementById("submenu3_"+i).style.background = "url("+js_ADIR+"/submenu_6.jpg) repeat-x"; }
  }
  document.getElementById("submenu1_"+a).style.background = "url("+js_ADIR+"/submenu_1.jpg) repeat-x";
  document.getElementById("submenu2_"+b).style.background = "url("+js_ADIR+"/submenu_2.jpg) repeat-x";
  document.getElementById("submenu2_"+b).style.fontWeight = "bold";
  document.getElementById("submenu3_"+c).style.background = "url("+js_ADIR+"/submenu_3.jpg) repeat-x";
}