Scraping bootstrap for phantom.js

phantom.js

var system = require('system');

var page = require('webpage').create();

var  url = "http://www.boston.com/bigpicture/";

var scrap = function(){
	var r = {};
  r.imgCount = $('img.bpImage').length;
  r.imgURL = [];
  $('img.bpImage').each(function(){
    r.imgURL.push($(this).attr('src'));
  });
  
	return JSON.stringify(r);
};

page.open(url, function(status) {
	if(status !== 'success') {
		throw "Page load issue " + status;
	}
	
	page.onError = function (msg, trace) {
		console.error('error > ' + msg);
		console.error(trace);
	};
	page.onAlert = function(msg) {
		console.error('alert > ' + msg);
	};
	page.onConsoleMessage = function (msg, line, source) {
	    var l = (line !== undefined) ? ' @ line: ' + line : '';
    	console.error('> ' + msg + l);
	};

	window.setTimeout(function(){
	  page.includeJs("https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js", function() {
  		var res = page.evaluate(scrap);

  		console.log(res);

  		phantom.exit();
	  });
	}, 1000);
 
});

Well written!
My problem is when I try to output an array like this: [[234.23,2342.12,"Hello"]] I always get the last string without quotation marks: [[234.23,2342.12,Hello]]