YUI({
    modules: {
        'gallery-idletimer': {
            fullpath: 'http://yui.yahooapis.com/gallery-2009.10.28-14/build/gallery-idletimer/gallery-idletimer-min.js',
            requires: ['event','event-custom'],
            optional: [],
            supersedes: []
      }
 
    }
}).use('gallery-idletimer', function(Y) {
 
    Y.IdleTimer.subscribe("idle", function(){
        //handle when the user becomes idle
    });
 
    Y.IdleTimer.subscribe("active", function(){
         //handle when the user becomes active
    });
 
    //start the timer with a default timeout of 30s
    Y.IdleTimer.start();
});