var timeout = prompt("设置刷新时间间隔[S]");  
    var current = location.href;  
    if(timeout > 0)  
    {  
        setTimeout('reload()', 1000 * timeout);  
    }  
    else  
    {  
        location.replace(current);  
    }  

    function reload()  
    {  
        setTimeout('reload()', 1000 * timeout);  
        var fr4me = '<frameset cols=\'*\'>\n<frame src=\'' + current + '\' />';  
        fr4me += '</frameset>';  

        with(document)  
        {  
            write(fr4me);  
            void(close());  
        };  
    }