Enable/Disable ASP.Net Required Validator on Client Side using JavaScript or jQuery

///////////////////
JAVASCRIPT-

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>

<script type="text/javascript">

    $(document).on("click", "#CheckBoxValidator1", function () {

        var valEmail = $("[id*=RequiredValidator1]");

        ValidatorEnable(valEmail[0], $(this).is(":checked"));

    });

</script>

//////////////////
HTML-

<asp:TextBox ID="txt_CheckValidator" runat="server"></asp:TextBox>

<asp:RequiredFieldValidator ID="RequiredValidator1" ControlToValidate="txtEmail"

    runat="server" ErrorMessage="*Required" ForeColor="Red" ValidationGroup="Group2" />

<br />

Enable Validation:

<input type="checkbox" id="CheckBoxValidator1" checked="checked" />

<br />

<asp:Button ID="Button1" Text="Submit" runat="server" ValidationGroup="Group2" />