var m_http = null;
		function $(x) {
			return document.getElementById(x); 
		}
		
		/* ask unit to update an element */
		function ajaxUpdater(id, url) {
			/* ie needs to load an activeX to do http reqests :-( */
			if (window.XMLHttpRequest) { /* Mozilla, Safari,...*/
				xmlhttp = new XMLHttpRequest();
			} else if (window.ActiveXObject) { /* IE */
				xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
			}
	
			/* we use post and not get because it makes the browser refresh
			 and not just use the cach */
			xmlhttp.open("GET", url);
			
			xmlhttp.onreadystatechange = function(){
				if(xmlhttp.readyState == 4){
					if (id != "") {
						$(id).innerHTML = xmlhttp.responseText;
					}
				}
			}
			
			xmlhttp.send(null);
		}
		
		/* send ?f=x after the file name */
		function send_key (ev,index) {
			if (ev.ctrlKey) {
				command = "f=" + index ;
			} else {
				command = "F=" + index ;
			}
			
			ajaxUpdater("", "key.cgi?" + command);
			
			/* we want to update the display after we send a key press */
			setTimeout ("update_disp();", 500);
		}
		
		/* update display */
		function update_disp() {
			/* to avoid getting the cached page, we ad a time stamp */
			disp_file = "text.html?" + (new Date()).getTime();
			ajaxUpdater("display", disp_file);
		}
		
		/* set a 10 sec interval updater of display */
		function init() {
			update_disp();
			setInterval ("update_disp();", 10000);
            var ts = new Date().getTime();
            SendRequest ("/par.cgi?getp=1&ts=" + ts,GotAnswerOffset, GotErr); 
		}

function GotAnswerOffset(data) {
    console.log ("good data");
    console.log (data);
    document.getElementById('inpOffset').value = eval( data)[0][0];
}

function SetValue() {
//"/par.cgi?setp="+point+","+val+",1"
    var url = '/par.cgi?setp=1,' + document.getElementById('inpOffset').value + ',1';
    SendRequest (url, null, null); 
}

function GotErr(data) {
    console.log ("Bad data");
    console.log (data);
}

function SendRequest (url, OnSucess, onFail) {
console.log (url);
    var _http_request = null;
    var _onfail = onFail;
    var _OnSucess = OnSucess;
    
    if (window.XMLHttpRequest) {
        _http_request = new XMLHttpRequest();
    }
    else if (window.ActiveXObject) {
        _http_request = new ActiveXObject("Microsoft.XMLHTTP");
    }
    var HandleAnswer = function() {
        if (_http_request.readyState == 4) {
            if (_http_request.status == 200) {
                if (_OnSucess) {
                    _OnSucess(_http_request.responseText);
                    _http_request.abort();
                }
            }
            else {
                if (_onfail) {
                    _onfail(_http_request.responseText);
                    _http_request.abort();
                }
            }
        } 
    }

    _http_request.onreadystatechange = HandleAnswer;
    _http_request.open('GET', url, true);
    _http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
    _http_request.send();
}