checkBrowserWidth.js

(function(){
	function getViewportWidth() {
    var e = window;
    var a = 'inner';
    if (!( 'innerWidth' in window )) {
        a = 'client';
        e = document.documentElement || document.body;
    }
    return e[ a + 'Width' ];
}

	var clientWidth = getViewportWidth();

	//If client uses big screen
	if (clientWidth && clientWidth > 920) {

	}
})();