How to check field sizes and make radiobutton requ

I am working on my first project with Spring, Spring-JS and DoJo(dijit) and I have two questions bases on the following coding example.

1) How do I check with Dojo (dijit) that the phone number field is the right size and also how do I check that the name field is bigger then 3 and less then 50?

2) As you can see my form has radio buttons which I need to set as required. How do I do that with Dojo (dijit).

Thanks

<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core"%>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jstl/fmt"%>
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%>


<script type="text/javascript"
    src="<c:url value="/resources/dojo/dojo.js" />">

</script>
<script type="text/javascript"
    src="<c:url value="/resources/spring/Spring.js" />">

</script>
<script type="text/javascript"
    src="<c:url value="/resources/spring/Spring-Dojo.js" />">

</script>

<link type="text/css" rel="stylesheet"
    href="<c:url value="/resources/dijit/themes/claro/claro.css" />" />
<html>
<head>
<title>Spring 3.0 MVC - Web Flow Example</title>
</head>
<body class="claro">
    <h2>Customer Registration</h2>

    <form:form commandName="customer">
        <input type="hidden" name="_flowExecutionKey"
            value="${flowExecutionKey}" />
        <div id="container">
            <table>
                <tr>
                    <td><b>Active</n></td>
                    <td ><form:radiobutton tabIndex="1" value="A" path="type" id="A" /></td>
                </tr>
                <tr>
                    <td ><b>Retired</b></td>
                    <td ><form:radiobutton tabIndex="2" value="R" path="type" id="R" />
                    <script type="text/javascript">
                            Spring.addDecoration(new Spring.ElementDecoration({
                                elementId : 'A',
                                widgetType : "dijit.form.RadioButton",
                                widgetModule : "dijit.form.CheckBox",
                                widgetAttrs : { value : "A", 
                                                required : true}
                            }));
                            Spring.addDecoration(new Spring.ElementDecoration({
                                elementId : 'R',
                                widgetType : "dijit.form.RadioButton",
                                widgetModule : "dijit.form.CheckBox",
                                widgetAttrs : { value : "R",
                                                required : true}
                            }));
                        </script>

                    </td>
                </tr>
                <tr>
                    <td><font color=red><form:errors path="name" /></font><b>Name:
                    </b></td>
                    <td><form:input path="name" class="value" /> <script
                            type="text/javascript">
                        Spring.addDecoration(new Spring.ElementDecoration({
                            elementId : "name",
                            widgetType : "dijit.form.ValidationTextBox",
                            widgetAttrs : {
                                promptMessage : "Enter Name",
                                required : true
                            }
                        }));
                    </script> <br />
                        <p></td>
                </tr>
                <tr>
                    <td><font color=red><form:errors path="phoneNumber" /></font>

                        <b>Phone number: </b></td>
                    <td>
                        <div class="span-7 last">
                            <form:input path="phoneNumber" />
                        </div> <script type="text/javascript">
                            Spring
                                    .addDecoration(new Spring.ElementDecoration(
                                            {
                                                elementId : "phoneNumber",
                                                widgetType : "dijit.form.ValidationTextBox",
                                                widgetAttrs : {
                                                    required : true,
                                                    invalidMessage : "A 16-digit credit card number is required.",
                                                    regExp : "[0-9]{16}"
                                                }
                                            }));
                        </script> <br />
                    </td>
                </tr>
                <tr>
                    <td><font color=red><form:errors path="address" /></font> <b>Address:
                    </b></td>
                    <td><form:input path="address" /> <script
                            type="text/javascript">
                        Spring.addDecoration(new Spring.ElementDecoration({
                            elementId : "address",
                            widgetType : "dijit.form.ValidationTextBox",
                            widgetAttrs : {
                                promptMessage : "Enter Address",
                                required : true
                            }
                        }));
                    </script> <br /></td>
                </tr>
                <tr>
                    <td><font color=red><form:errors path="city" /></font> <b>City:
                    </b></td>
                    <td><form:input path="city" /> <script type="text/javascript">
                        Spring.addDecoration(new Spring.ElementDecoration({
                            elementId : "city",
                            widgetType : "dijit.form.ValidationTextBox",
                            widgetAttrs : {
                                promptMessage : "Enter City",
                                required : true
                            }
                        }));
                    </script> <br /></td>
                </tr>
                <tr>
                    <td><font color=red><form:errors path="state" /></font> <b>State:
                    </b></td>
                    <td><form:input path="state" /> <script
                            type="text/javascript">
                        Spring.addDecoration(new Spring.ElementDecoration({
                            elementId : "state",
                            widgetType : "dijit.form.ValidationTextBox",
                            widgetAttrs : {
                                promptMessage : "Enter State",
                                required : true
                            }
                        }));
                    </script> <br /></td>
                </tr>
                <tr>
                    <td><font color=red><form:errors path="zipCode" /></font> <b>Zip
                            Code: </b></td>
                    <td><form:input path="zipCode" /> <script
                            type="text/javascript">
                        Spring.addDecoration(new Spring.ElementDecoration({
                            elementId : "zipCode",
                            widgetType : "dijit.form.ValidationTextBox",
                            widgetAttrs : {
                                promptMessage : "Enter Zip Code",
                                required : true
                            }
                        }));
                    </script> <br /></td>
                </tr>
            </table>
        </div>

        <input type="submit" name="_eventId_submit" id="submit" value="Submit" />
        <input type="submit" name="_eventId_cancel" value="Cancel" />
        <script type="text/javascript">
            Spring.addDecoration(new Spring.ValidateAllDecoration({
                elementId : 'submit',
                event : 'onclick'
            }));
        </script>
    </form:form>

</body>
</html>

so here is an answer to the radiobutton, with an example:

Spring.addDecoration(new Spring.ElementDecoration({
      elementId : 'A',
      widgetType : "dijit.form.RadioButton",
      widgetModule : "dijit.form.CheckBox",
      validate: function (){
           if(dojo.query('INPUT[name=type]', 'customer').filter(function(n){return n.checked;}).length > 0){return true;} else {alert('choose a type');return false;}
      },
      widgetAttrs : ...
}));

now you should be able to do the same with your name field