Question : Call javascript function when reguular expression validator on the textbox fails!

hi,
i have a text box, on which i need to fire a javascript function as soon as the Regular expression validator on it fails:
the code is here, i tried onpropertychange but it works only on IE i need it to work on Firefox as well.Please advise
<td align="left"><asp:TextBox id="TextBoxUserName" runat="server" Columns="32" Width="200"></dsf:TextBox></td>
                                                                          <td align="left"><asp:RequiredFieldValidator id="RequiredFieldValidatorUserName" runat="server" ForeColor=" "
                                                                                      ControlToValidate="TextBoxUserName" Display="Dynamic"></asp:RequiredFieldValidator>
                                                                                      <asp:RegularExpressionValidator ID="verifyXssUserNameCharacter" ControlToValidate="TextBoxUserName" ErrorMessage="##Error"
                                 ValidationExpression="^[^<>]+$" runat="server" CssClass="textRed" ></asp:RegularExpressionValidator></td>

Answer : Call javascript function when reguular expression validator on the textbox fails!

it's worked.
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