//added by JG 3/10/2011, to extend selectors.
// Example:
//if ($('#whatever').is(':inView') ) {...}
jQuery.extend(jQuery.expr[':'], {
        inView: function(a) {
            var st = (document.documentElement.scrollTop || document.body.scrollTop),
                ot = jQuery(a).offset().top,
                wh = (window.innerHeight && window.innerHeight < jQuery(window).height()) ? window.innerHeight : jQuery(window).height();
            return ot > st && (jQuery(a).height() + ot) < (st + wh);
        }
});