hide the validation error message

Question

I need to hide the validation message when a user starts typing  the first litter automatically not until move the mouse to another place 

 

I have this code for the validation

 

 

<asp:RequiredFieldValidator ErrorMessage="Write something!" ID="RequiredFieldValidator1" ForeColor="Red" ControlToValidate="txtContent"

runat="server" ValidationGroup="click" Display="Dynamic" />

 

 

please try to help