window.onunload = function() { requestEnd(); }  //页面迁移时调用此方法
        function requestEnd(){          
        var t_id=document.getElementById(getClientId().Id1).value  ;   //  获取访问的ID       
        
        var url="../cmn/cmn_access.aspx?t_id=" + t_id ;         
         
        var rsf=YAHOO.util.Connect.asyncRequest("GET",url,"");        //通过ajax来更新数据库
	 
	 return rsf;
       }