来个人救救我吧，表单验证老师无缘无故的跑到servlet里面去

<form name="addForm" action="/SuperMarket/DoAddUserServlet" method="post" onsubmit="return checkInput()">

                <div>

                    <label for="userName">用户名称：</label>

                    <input type="text" name="userName" id="userName" maxlength="8"/>

                     <span style='color:#6600ff;'>*请输入用户名称</span>

                </div>

                <div>

                    <label for="userpassword">用户密码：</label>

                    <input type="password" name="userpassword" id="userpassword" maxlength="10"/>

                    <span style='color:#6600ff;'>*密码长度必须大于6位小于8位</span>



                </div>

                <div>

                    <label for="userRemi">确认密码：</label>

                    <input type="password" name="userRemi" id="userRemi" maxlength="10"/>

                     <span style='color:#6600ff;'>*请输入确认密码</span>

                </div>

                <div>

                    <label >用户性别：</label>

                    <select name="sex"> 

                         <option value="0" >女</option>    

                         <option value="1" >男</option>   

                    </select>

                    <span></span>

                </div>

                <div>

                    <label for="data">年龄：</label>

                    <input type="text" name="age" id="age" maxlength="2"/>

                </div>

                <div>

                    <label for="userphone">用户电话：</label>

                    <input type="text" name="userphone" id="userphone" maxlength="3"/>

                </div>

                <div>

                    <label for="userAddress">用户地址：</label>

                    <input type="text" name="userAddress" id="userAddress"  maxlength="10"/>

                </div>

                <div>

                    <label >用户类别：</label>

                     <input type="radio" name="userlei" value="1"/>管理员

                    <input type="radio" name="userlei"  value="2" />游客

                    <input type="radio" name="userlei"  value="3"/>大老板

                </div>

                <div class="providerAddBtn">

                    <!--<a href="#">保存</a>-->

                    <!--<a href="userList.html">返回</a>-->

                    <input type="submit" value="保存" />

                    <input type="button" value="返回" onclick="history.go(-1)"/>

                </div>

            </form>

        </div>



    </div>

</section>

<footer class="footer">

    版权归JKTAO所有

</footer>

<script src="js/time.js"></script>

</body>

<script type="text/javascript">

function checkInput(){



	var oUsername=document.addForm.userName;

	var oPassword=document.addForm.userpassword;

	var userRemiPassword=document.addForm.userRemi;

	var age=document.addForm.age;

	var phone=document.addForm.userphone;

	var address=document.addForm.userAddress;

	if(oUsername.value.length==0){

	   alert("用户名不能为空");

	   oUsername.select();

	   return false;

	}



   if(oPassword.value.length<2 || oPassword.value>5){

    alert("密码长度不合法");

    alert(oPasseord/value.length);

    return false;

    }

     if(userRemiPassword.value.length<2 || userRemiPassword.value>5){

    alert("再次输入的密码长度不合法");

    return false;

    } 

     if(oPassword.value!= userRemiPassword.value)

            {

               alert(oPassword);

                alert("密码不匹配");

                return false;

                 

            }

	if(age.value.length==0){

	alert("年龄不能为空");

	return false;

	}

	

	if(phone.value.length==0){

	alert("电话不能为空");

	return false;

	}

	if(userAddress.value.length==0){

	alert("地址不能为空");

	return false;

	}

	//重重困难后 返回true

	return true;

}



</script>

上面是部分代码，问题是偶的不合法突然跑到servlet里面的页面去，还有问题是我明显两次输入的密码呀一样提示不匹配，来个人救救我吧