Track & display mouse movements

mousetrack.js

jQuery(function($) { 
    if (!Date.now) Date.now = function() { return new Date().getTime() }; // shim
    var prev = {x:0,y:0,time:Date.now(),lastEv:{}}, mover = function (e) {   
        // send event to server with X and Y
        var tdiff = e.timeStamp - prev.time;
        if ( (Math.abs(e.pageX - prev.x) + Math.abs(e.pageY - prev.y) > 150) || (tdiff > 1500) ) {
           
           oAJAX.send("send Mouse X & Y, tagName " + 
                   "and Current Date/Time to the millisecond", prev.x=e.pageX, prev.y=e.pageY, prev.time = e.timeStamp || Date.now(), describe(e.target), prev.lastEv=e);
           marker.animate({top:prev.y,left:prev.x},'fast');
        }
    };

    function describe(elem) { 
        if (elem && elem.tagName) return elem.tagName + (elem.id ? ('#' + elem.id) : elem.className ? ('.' + elem.className.replace(/\s+/g, '.')) : '' ) 
    }

    $(document).unbind('mousemove', mover).mousemove(mover);

    var marker = jQuery('<div>').css({'position':'absolute', 'background-color':'yellow'}).text('X');
    jQuery(document.body).append(marker);
    var sizing = Math.sqrt( $(document).width() * $(window).height() ) / 8; // 8x8 grid ~ 134 pixels
    var oAJAX = { send: function (msg) { console.log(msg, arguments) } } 
});

http://www.codeproject.com/Articles/18524/Web-Session-Monitor-Record-and-Video-Playback