runaround.js

// Base stream obj
var user_activity = {
    'id' : new Date().getTime() + navigator.userAgent,
    'uri' : document.location.pathname,
    'stream' : {}
};
var INTERVAL = 2000; // check cursor every 2 secs

function log_activity(e){
    var d = new Date();
    ts = d.getTime(); // utc timestamp
    
    user_activity.stream[ts] = {
        't'    : window.scrollY,
        'x'         : window.mouseX,
        'y'         : window.mouseY
    }
}

document.onmousemove = function(e) {
    var event = e || window.event;
    window.mouseX = event.clientX;
    window.mouseY = event.clientY;
}

setInterval(log_activity, INTERVAL);

window.onbeforeunload = function(){
  jQuery.each(user_activity.stream, function(k,v){
    console.log(k,v);
  });
};