screen 10 times

screener.js

var url = 'http://www.google.com';
var prefix = 'CA';
var totalScreenshots = 10;
var screenshotDelay = 10; // seconds
var i = 0;

function makeScreenshot(url, filename, callback) {
    var page = new WebPage();
    page.settings.userAgent = 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:16.0) Gecko/20100101 Firefox/16.0';
    page.open(url, function(status) {
        var timeoutId = setInterval(function() {
            page.render(filename);
            clearInterval(timeoutId);
            callback.apply();
        }, 1000 * screenshotDelay);
    });
}

function process() {
    if (++i <= totalScreenshots) {
        var filename = prefix + '_' + i + '.png';
        console.log(filename);
        makeScreenshot(url, filename, process);
    } else {
        phantom.exit();
    }
}

process();