<script>
        // 全选 
        function allCheck() 
        { 
            for (var i=0;i<Form1.elements.length;i++) 
            { 
                var e=Form1.elements[i]; 
                if (e.type=='checkbox') 
                e.checked=true; 
            } 

        } 
        //反选 
        function revCheck() 
        { 
            for (var i=0;i<Form1.elements.length;i++) 
            { 
            var e=Form1.elements[i]; 
            if (e.type=='checkbox') 
            e.checked= false;
            } 
        } 
        
        function CheckBoxSelect()
        {
           var cb=document.getElementById("cbAll");
           if(cb.checked)
           {
              allCheck();
           }
           else
           {
             revCheck();
           }
        }
        </script>