Use jQuery's $.ajax to ping a URL and report the response

jquery.checkurl.js

$.ajax({url: "http://www.google.com/",
        type: "HEAD",
        timeout:1000,
        statusCode: {
            200: function (response) {
                console.log('Status 200: Page is up!');
            },
            400: function (response) {
                console.log('Status 400: Page is down.');
            },
            0: function (response) {
                console.log('Status 0: Page is down.');
            }              
        }
 });