var http_request = false; 
var winname;
var winnr;

function mouseY(evt) {
  if (evt.pageY) return evt.pageY;
  else if (evt.clientY)
     return evt.clientY + (document.documentElement.scrollTop ?
     document.documentElement.scrollTop :
     document.body.scrollTop);
  else return null;
}

function getContent(url, layer_id) { 

    winname = layer_id;
    //resize_div();
    document.getElementById(winname).innerHTML = "";
    document.getElementById("ajax_container").style.display = "block"; 
    document.getElementById(layer_id).style.display = "block"; 
    document.getElementById(layer_id).style.cursor = "wait";
    http_request = false; 

    if (window.XMLHttpRequest) { // Mozilla, Safari,... 
        http_request = new XMLHttpRequest(); 
        if (http_request.overrideMimeType) { 
            http_request.overrideMimeType('text/xml'); 
            // zu dieser Zeile siehe weiter unten 
        } 
    } else if (window.ActiveXObject) { // IE 
        try { 
            http_request = new ActiveXObject("Msxml2.XMLHTTP"); 
        } catch (e) { 
            try { 
                http_request = new ActiveXObject("Microsoft.XMLHTTP60"); 
                
            } catch (e) {} 
        } 
    } 

    if (!http_request) { 
        return false; 
    } 
    http_request.onreadystatechange = showContent; 
    http_request.open('GET', url, true); 
    http_request.send(null); 

}

function showContent() { 
    if (http_request.readyState == 4) { 
      var answer = http_request.responseText; 
      document.getElementById(winname).innerHTML = answer;
      document.getElementById(winname).style.cursor = "default";
    } 

}

function close_div(layer_id) {
  document.getElementById(layer_id).style.display = "none";
  document.getElementById(layer_id).style.height = "1px";
}