验证后跳转 (javascript) 的小问题

<script>
         function check( i)
         {  
            
            if (Number(i)<10)
              return window.confirm ("小于10确定吗");
              else
               return  true;
               
         }
         
        </script>

 

private void Page_Load(object sender, System.EventArgs e)
        {
            // 在此处放置用户代码以初始化页面


            Button1.Attributes.Add ("onclick",
                "return confirm (\"确定要跳转吗?\") ;");

            Button2.Attributes.Add ("onclick",
                "return check(3)");


        }