function createRequestObject() {
    var ro;
    var browser = navigator.appName;
    if(browser == "Microsoft Internet Explorer"){
        ro = new ActiveXObject("Microsoft.XMLHTTP");
    }else{
        ro = new XMLHttpRequest();
    }
    return ro;
}

var http = createRequestObject();

function sendReq(serverFileName,action) {
    http.open('get', serverFileName+'?action='+action);
    //http.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=ISO-8859-2');
    http.onreadystatechange = handleResponse;
    http.send(null);
}

function sendReqA(serverFileName, variableNames, variableValues) {
	var paramString = '';

	variableNames = variableNames.split(',');
	variableValues = variableValues.split(',');

	for(i=0; i<variableNames.length; i++) {
		paramString += variableNames[i]+'='+variableValues[i]+'&';
	}
	paramString = paramString.substring(0, (paramString.length-1));

	if (paramString.length == 0) {
	   	http.open('get', serverFileName);
	}
	else {
		http.open('get', serverFileName+'?'+paramString);
	}
    http.onreadystatechange = handleResponse;
    http.send(null);
}


function sendReqForm(serverFileName, obj) {

    var paramString = '';
    var variableNames = obj.name;
	var variableValues = obj.value;

	paramString += variableNames+'='+variableValues+'&';
	paramString = paramString.substring(0, (paramString.length-1));

	if (paramString.length == 0) {
	   	http.open('get', serverFileName);
	}
	else {
		http.open('get', serverFileName+'?'+paramString);
	}
    http.onreadystatechange = handleResponse;
    http.send(null);
}

function handleResponse() {
    if(http.readyState == 4){
        var response = extractResponse(http.responseText);
        var update = new Array();

        if(response.indexOf('|',0) != -1) {
            update = response.split('|');
            document.getElementById(update[0]).innerHTML = update[1];
        }
    }
}


function extractResponse(responseText) {

    var msg="";
    var tagopen="<msg>";
    var tagclose="</msg>";
    var S1=responseText.indexOf(tagopen,0);
    if (S1>=0) { S1+=tagopen.length }
    var S2=responseText.indexOf(tagclose,0);
    if (S2>S1) { msg=responseText.substring(S1,S2) }
    return msg;
}





var http_request = false;

function makePOSTRequest(url, parameters) {
  http_request = false;

  if (window.XMLHttpRequest) { // Mozilla, Safari,...
     http_request = new XMLHttpRequest();
     if (http_request.overrideMimeType) {
        http_request.overrideMimeType('text/xml');
     }
  } else if (window.ActiveXObject) { // IE
     try {
        http_request = new ActiveXObject("Msxml2.XMLHTTP");
     } catch (e) {
        try {
           http_request = new ActiveXObject("Microsoft.XMLHTTP");
       } catch (e) {}
     }
  }
  if (!http_request) {
     alert('Cannot create XMLHTTP instance');
     return false;
  }

  http_request.onreadystatechange = alertContents;
  http_request.open('POST', url, true);
  http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
  http_request.setRequestHeader("Content-length", parameters.length);
  http_request.setRequestHeader("Connection", "close");
  http_request.send(parameters);
}


var http_request = false;

function makeGETRequest(url, parameters) {

  http_request = false;
  
  if (window.XMLHttpRequest) { // Mozilla, Safari,...
     http_request = new XMLHttpRequest();
     if (http_request.overrideMimeType) {
        http_request.overrideMimeType('text/html');
     }
  } else if (window.ActiveXObject) { // IE
     try {
        http_request = new ActiveXObject("Msxml2.XMLHTTP");
     } catch (e) {
        try {
           http_request = new ActiveXObject("Microsoft.XMLHTTP");
        } catch (e) {}
     }
  }
  if (!http_request) {
     alert('Cannot create XMLHTTP instance');
     return false;
  }
  http_request.onreadystatechange = alertContents;
  http_request.open('GET', url + parameters, true);
  http_request.send(null);
}


function alertContents() {
  if (http_request.readyState == 4) {
     if (http_request.status == 200) {
        result = http_request.responseText;
        //document.getElementById('test').innerHTML = result;
        if(result.indexOf('|' != -1)) {
            update = result.split('|');
            document.getElementById(update[0]).innerHTML = update[1];
        }
        
     } else {
        alert('There was a problem with the request.');
     }
  }
}