Greetings, I'm try to do valdation textbox input to valdate a phone number. I have a asp.net textbox and checkbox. the defualt is to validate a us phone number and when I check the checkbox I should change the RegularExpression and error message to validate an international phone using my own RegularExpression. I have no problem to validate the international phone but the problem is when validating the usa phone number I'm always getting error message that it is invalde phone number. I used diffrent RegularExpression but did not work.

Please look at my code and davice me.

Regards, !

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ASP.net Code
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<%@ Page Language="C#" MasterPageFile="~/Master.Master" AutoEventWireup="true" CodeBehind="UpdateContact.aspx.cs" Inherits="IMAM_APPLICATION.UpdateContact" Title="Untitled Page" %>

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">


    <script src="js/jquery-1.4.1-vsdoc.js" type="text/javascript"></script>

    <script src="js/jquery.validate.js" type="text/javascript"></script>

    <script src="js/js.js" type="text/javascript"></script>

     <script type="text/javascript">
         $(document).ready(function() {

         ValidPhoneHome("#<%= chkIntphoneHome%>");
     $("#aspnetForm").validate({

            // debug: true,


             rules: {



                 "<%=txtHomePhone.UniqueID %>": {

                     phonehome: true



                 }

                 },
                   errorElement: "mydiv",
             wrapper: "mydiv",  // a wrapper around the error message

             errorPlacement: function(error, element) {
                 offset = element.offset();
                 error.insertBefore(element)
                 error.addClass('message');  // add a class to the wrapper
                 error.css('position', 'absolute');
                 error.css('left', offset.left + element.outerWidth());
                 error.css('top', offset.top - (element.height() / 2));

             }



         });
         })

</script>

<div id="mydiv">
 <asp:CheckBox ID="chkIntphoneHome" runat="server" Text="Internation Code" Style="position: absolute;
                    top: 620px; left: 700px;"  onclick=" ValidPhoneHome(this)" />

                <asp:TextBox ID="txtHomePhone" runat="server" Style="top: 650px; left: 700px; position: absolute;
                    height: 22px; width: 128px" ></asp:TextBox>

  </div>

</asp:Content>            


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js.js File  
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var RegularExpression;
 var USAPhone = /(^[a-z]([a-z_\.]*)@([a-z_\.]*)([.][a-z]{3})$)|(^[a-z]([a-z_\.]*)@([a-z_\.]*)(\.[a-z]{3})(\.[a-z]{2})*$)/i;

        var InterPhone = /^\d{9,12}$/;
        var errmsg;


        function ValidPhoneHome(sender) {




            if (sender.checked == true) {
                RegularExpression = InterPhone;
                errmsg = "Enter 9 to 12 numbers as international number";

            }
            else {

                RegularExpression = USAPhone;
                errmsg = "Enter a valid number";

            }


            jQuery.validator.addMethod("phonehome", function(value, element) {
                return this.optional(element) || RegularExpression.test(value);
            }, errmsg);
        }