Including a local version of a library that failed to load

I am using PhantomJS to take a screenshot of a page every five minutes, and it works correctly most of the time. The problem is that sometimes the page I am taking a screenshot of fails to load the AngularJS library, and then, it can't build the page after that. So I am trying to figure out how to load a local copy in its place. Here is what I have been trying...

var page = require('webpage').create(),system = require('system');
var home = 'http://ift.tt/1CSEuAY';

page.open(home, function (status) {
    if(status === "success"){
        page.injectJs('angular.js');
        window.setTimeout((function() {
            page.evaluate(function () {
                /*stuff*/
            });
        }), 2000);
    }
});

So angular.js is the name of my local copy of what the site would normally download. The site calls the script at the end of the body with several other scripts, and I am trying to find the best way to include it. I am wondering if it needs to be included by replacing the script tag in the html so it can be loaded in sequence, but I am not sure how to do that.

Thanks