go to the previous page (used by previous page link)
    function doPrevSearchPage() {

        var bing = document.forms.bing;
        var query = bing.query.value;
        var offset = parseInt(bing.offset.value, 10);
        var count = parseInt(bing.count.value, 10);
        if (offset) {
            offset -= count;
            if (offset < 0) offset = 0;
            bing.offset.value = offset;
            return bingNewsSearch(query, bingSearchOptions(bing), getSubscriptionKey());
        }
        al