>
>The next one I am trying to do is enabling a "Continue" button when all three of the userID, Password, and retype password textboxs have been filled out or validated client side. Basically I do not want them to continue until I have valid values in all three boxes and the two passwords match. How would you approach this? I am adding jQuery into this project now.

The easiest might be to hook into the lost focus event of the controls and do the validation there. If you want to display an error message (to let them know their passwords don't match) then you'll want to add something like a div section with the message and hide or show it selectively. Something like this:

        <script type="text/javascript"
            $(document).ready(function () {
                $("#<%= this.txtUsername.ClientID %").blur(validatePassword);
                $("#<%= this.txtPassword.ClientID %").blur(validatePassword);
                $("#<%= this.txtRetypePassword.ClientID %").blur(validatePassword);
            });

            function validatePassword() {
                var username = $("#<%= this.txtUsername.ClientID %").val();
                var password = $("#<%= this.txtPassword.ClientID %").val();
                var retype = $("#<%= this.txtRetypePassword.ClientID %").val();
                var empty = (username.length == 0) || (password.length == 0) || (retype.length == 0);

                var valid = !empty && (password == retype);

                if (!empty && !valid) {
                    $("#password").show();
                }
                else {
                    $("#password").hide();
                }

                $("#txtLogin").attr('disabled', !valid);               
            }
        </script

        <div id="password" style="display:none;"The entered passwords do not match.</div