function CurrentTime(screen){ 
            var s=document.getElementById(screen);
            var now = new Date();
            var year=now.getFullYear();
            var month=now.getMonth()+1;
            var date=now.getDate(); 
            var hh = now.getHours(); 
            var mm = now.getMinutes(); 
            var ss = now.getSeconds();
            var w=now.getDay();
            switch(w)
            {
                case 1:
                    w='星期一';
                break;
                case 2:
                    w='星期二';
                break;
                case 3:
                    w='星期三';
                break;
                case 4:
                    w='星期四';
                break;
                case 5:
                    w='星期五';
                break;
                case 6:
                    w='星期六';
                break;
                case 0:
                    w='星期日';
                break;
            }
            var clock =year+'年'+month+'月'+date+'日'+'&nbsp;<strong>'+ hh+':'; 
            if (mm < 10) clock += '0';
            clock += mm+':'; 
            if (ss < 10) clock += '0';
            clock += ss; 
            clock+='</strong>&nbsp;'+w;
            s.innerHTML=clock;
            setTimeout("CurrentTime('"+screen+"');",1000);
         }
         CurrentTime('ctime');