jQuery snippet to enable/disable a sticky nav based on his distance from window top

Sticky navigation

var _window = $(window),
    nav     = $('#navigation');

_window.ready(function(){
	var navOffset = nav.offset().top;
	_window.scroll(function(){
		var scrollPos = _window.scrollTop();

		if( scrollPos > navOffset ) {
			nav.addClass('fix');
		} else {
			nav.removeClass('fix');
		}

	});
});