ASP Net Validator

I have several fields being validated and if left blank an "*" is being placed to the left of the box.  One of my executives would like it to blink.  How do I do that?

Below is what I currently have:

:RequiredFieldValidator ID="txtCustNameRequireFieldValidator" ValidationGroup="CustVal" runat="server" ErrorMessage="Customer Name is  required." ControlToValidate="txtCustName" Text="*" Display="Dynamic">asp:RequiredFieldValidator><asp:TextBox ID="txtCustName"runat="server">asp:TextBox>