var casper;

casper = require("casper").create();

/* listening to a custom event */
casper.on("google.loaded", function(title) {
    casper.echo("Google page title is " + title);
});

casper.start("http://google.com/", function() {
    /* emitting a custom event */
    this.emit("google.loaded", this.getTitle());
});

casper.run();