动态加载Jquery

  function AjaxLoadJquerylibrary()  
        {  
            var d = document, s = d.getElementById('firebug-lite');  
            if (s != null)  
                return;  
            s = d.createElement('script');  
            s.type = 'text/javascript';  
            s.src = 'http://ajax.googleapis.com/ajax/libs/jquery/1.3.1/jquery.min.js';  
            d.body.appendChild(s);  
            document.getElementById("content").style.display = "block";  
        }