var Responsive = {

    maxPhoneWidth: 775,

    maxTabletWidth: 925,

    //REDIRECT BASED ON CONFIGURABLE MAX WIDTH THRESHOLD

    maxWidthRedirect: function (maxWidth, url) {

        var viewport = this.getWindowSize();

        //ADD EXCLUSION IN HASH IN CASE DESKTOP VIEWING IS INTENDED

        if (window.location.hash != '#desktop' && viewport.width < maxWidth)

            window.location.href = url;

    },

    //REDIRECT BASED ON RECOMMENDED PHONE WIDTH THRESHOLD

    mobileRedirect: function (url) {

        this.maxWidthRedirect(this.maxPhoneWidth, url);

    },

    //REDIRECT BASED ON RECOMMENDED TABLET WIDTH THRESHOLD

    tabletRedirect: function (url) {

        this.maxWidthRedirect(this.maxTabletWidth, url);

    },

    //DETERMINE CROSS-BROWSER SCREEN SIZE

    getWindowSize: function () {

        var w = window,

            d = document,

            e = d.documentElement,

            g = d.getElementsByTagName('body')[0],

            x = w.innerWidth || e.clientWidth || g.clientWidth,

            y = w.innerHeight || e.clientHeight || g.clientHeight;

        return { width: x, height: y };

    }

};

​

//NOTIFY VIEWPORT SIZE

var viewport = Responsive.getWindowSize();

alert('width: ' + viewport.width + ', height: ' + viewport.height);

​

​

//REDIRECT USERS TO MOBILE SITE IF LESS THAN 775PX

Responsive.mobileRedirect('http://www.google.com/mobile/');