js表单验证，求指导

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
    <title>用户注册</title>
    <link href="login.css" type="text/css" rel="stylesheet"/>
    <script language="JavaScript" type="text/javascript">
    function Check()
    {
        if(!checkUserName()){return false;}
        else if(!checkPassword()){return false;}
        else if(!checkRePsaaword()){return false;}
        else if(!checkNickName()){return false;}
        else if(!checkEmail()){return false;}
        else if(!checkAnswer()){return false;}
        return true;
    }
    function checkUserName()
    {
        var name=document.getElementById("name").value;
        if(name=="")
        {
            alert("用户名不能为空，请输入用户名");
            return false;

        }
        for(var i=0;i<name.length;i++)
        {
            var temp=name.charAt(i);
            if(!(temp<=9&&temp>=0)&&!(temp>='a'&&temp<='z')&&!(temp>='A'&&temp<='Z'))
            {
                alert("用户名必须是有数字字母组成(可全数字也可全字母)");
                return false;
            }
        }
        return true;
     }

    function checkPassword()
    {
        var password=document.getElementById("pwd").value;
        if(password==null||""==password.replace(/(^\s*)|(\s*$)/g, ""))
        {
            alert("密码不能为空，请输入密码");
            return false;
        }
        for(var i=0;i<password.length;i++)
        {
            var temp=name.charAt(i);
            if(!(temp<=9&&temp>=0)&&!(temp>='a'&&temp<='z')&&!(temp>='A'&&temp<='Z'))
            {
                alert("密码必须是有数字字母组成(可全数字也可全字母)");
                return false;
            }
        }
        return true;
    }
    function checkRePsaaword()
    {
        var repassword=document.getElementById("rpwd").value;
        var password=document.getElementById("pwd").value;

        if(repassword==null||""==repassword.replace(/(^\s*)|(\s*$)/g, ""))
        {
            alert("请再次输入密码")
            return false;
        }
        if(password!=repassword)
        {
            alert("两次输入的密码不同，请重新输入");
            return false;
        }
        return true;
    }
    function checkNickName()
    {
        var nickname=document.getElementById("nick").value;
        if(nickname==null||""==nickname.replace(/(^\s*)|(\s*$)/g, ""))
        {
            alert("请次输入昵称");
            return false;
        }
        if(nickname.length<0||nickname.length>=20)
        {
            alert("昵称长度超过限制，请重新输入");
            return false;
        }
        return true;
    }
    function checkEmail()
    {
        var email=document.getElementById("Email").value;
        if(email==null||""==email.replace(/(^\s*)|(\s*$)/g, ""))
        {
            alert("请输入邮箱");
            return false;
        }
        //var myreg = /^([a-zA-Z0-9]+[_|\_|\.]?)*[a-zA-Z0-9]+@([a-zA-Z0-9]+[_|\_|\.]?)*[a-zA-Z0-9]+\.[a-zA-Z]{2,3}$/;
        var strReg=/^\w+((-\w+)|(\.\w+))*\@{1}\w+\.{1}\w{2,4}(\.{0,1}\w{2}){0,1}/ig;
        var r=email.search(strReg);
        if(r==-1) {
            alert("邮箱格式错误!");
            return false;
        }
        return true;
    }
    function checkAnswer()
    {

        var answer=document.getElementById("awr").value;
        if(answer==null||""==answer.replace(/(^\s*)|(\s*$)/g, ""))
        {
            alert("请输入密码保护问题");
            return false;
        }
        if(answer.length>=20)
        {
            alert("密码保护问题的长度超过限制，请重新输入");
            return false;
        }
        return true;
    }
</script>
</head>
<body>
<form id="Form1" action="register.action" onsubmit="return Check()" method="post">
<div style="width:100%;">
    <div align="center">
       <div id="Main">
            <div id="Heading">注册  </div>
            <label class="MyLabel">帐号</label>
            <div class="line">
                <input name="username" id="name" class="Testbox" type="text" onblur="checkUserName()"/> 
            </div>
            <label class="MyLabel">密码</label>
            <div class="line">
                <input name="password" id="pwd" class="Textbox" type="password" onblur="checkPassword()"/>
            </div>
            <label class="MyLabel">确认密码</label>
            <div class="line">
                <input name="repassword" id="rpwd" class="Textbox" type="password" onblur="checkRePsaaword()"/> 
            </div>
            <label class="MyLabel">昵称</label>
            <div class="line">
                <input name="nickname" id="nick" class="Textbox" type="text" onblur="checkNickName()"/> 
            </div>
            <label class="MyLabel">邮箱</label>
            <div class="line">
                <input name="email" id="Email" class="Textbox" type="text" onblur="checkEmail()"/> 
            </div>
            <label class="MyLabel">密码保护问题</label>
            <div class="line">
                <select name="question" class="selects">
                    <option value="你的生日">你的生日</option>
                    <option value="你的家乡">你的家乡</option>
                    <option value="你最喜欢的食物">你最喜欢的食物</option>
                </select>
            </div>
            <label class="MyLabel">密码保护的答案</label>
            <div class="line">
                <input name="answer" id="awr" class="Textbox" type="text" onblur="checkAnswer()"/> 
            </div>
            <div>
                <input name="btnLogin" value="注册"  id="btnLogin" class="Button" style="margin-top: 8px" type="submit"/>
            </div>
            <div style="line-height:1.8em;margin-top:10px;">
                » <a href="login.jsp" title="登陆"><b>立即登陆</b></a>
            </div>
            <div style="clear: both"></div>
        </div>
    </div>
</div>
</form>
</body>
</html>
细心点就好了

调试易

js表单验证，求指导

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