function send_xmlhttprequest(obsluha, method, url, content, headers)
{
 if (window.XMLHttpRequest) {
 var xmlhttp = new XMLHttpRequest();
 } else if (window.ActiveXObject) {
 try {
 var xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
 } catch (eror) {
 var xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
 }
 }
 if (!xmlhttp) {
 return false;
 }
 xmlhttp.open(method, url);
 xmlhttp.onreadystatechange = function() {
 if (xmlhttp.readyState == 4) {
 if (xmlhttp.status == 200) {
 obsluha(xmlhttp, true);
 } else {
 obsluha(xmlhttp,false);
 }
 }
 };
 if (headers) {
 for (var key in headers) {
 xmlhttp.setRequestHeader(key, headers[key]);
 }
 }
 xmlhttp.send(content);
 return true;
}

function obsluha(xh,res) {
 var msg='';
 if (res) msg=xh.responseText;
 else msg='Chyba spojení';
 alert(msg);
}