function findPos(obj) {
      var curleft = curtop = 0;
      if (obj.offsetParent) {
        do {
          curleft += obj.offsetLeft;
          curtop += obj.offsetTop;
        } while (obj = obj.offsetParent);
      return [curleft,curtop];
      }
}

function hm_logClick(e)
{
    if (!e) e = window.event;

    var check = document.getElementsByTagName('div')[0];
    if (check != 'undefined') 
    {
      var theContainer = check;
    }
    else
    {
      var theContainer = document.getElementByTagName('body');
    }
    
    var coords = findPos(theContainer);
    var addx, addy;
    addx = coords[0];
    addy = coords[1];
    
    var scrollPos;
    if (typeof window.pageYOffset != 'undefined') {
      scrollPos = window.pageYOffset;
    }
    else if (typeof document.compatMode != 'undefined' &&
      document.compatMode != 'BackCompat') {
      scrollPos = document.documentElement.scrollTop;
    }
    else if (typeof document.body != 'undefined') {
      scrollPos = document.body.scrollTop;
    }
    
    scLeft = document.body.scrollLeft;
    scTop = scrollPos;

    if (IE)
    {
        // kein Rechtsklick
        if (typeof(e.button) != 'undefined' && e.button == 2) return;
          
        clickX = e.clientX + scLeft - addx
        clickY = e.clientY + scTop - addy
    }
    else
    {
        // kein Rechtsklick
        if (typeof(e.which) != 'undefined' && e.which == 3) return;
        
        clickX = e.pageX - addx
        clickY = e.pageY - addy
    }

    var url='send_click.php?x=' + clickX + '&y=' + clickY;
    hm_sendClickAjaxReq(url);
    
    return true;
}

// AJAX
function hm_sendClickAjaxReq(url)
{
    var ajaxRequest;
    if (typeof(window.ActiveXObject) == 'undefined')
        ajaxRequest = new XMLHttpRequest();
    else
        ajaxRequest = new ActiveXObject('Microsoft.XMLHTTP');
    ajaxRequest.open('GET', url, true);
    ajaxRequest.send(null);
}

// IE
var IE = document.all ? true : false

if (!IE) document.captureEvents(Event.MOUSEMOVE)
document.onmousedown = hm_logClick;