Required Field Validator only working in IE - not in chrome or firefox

[songokuze]

In my asp.net (vb on server side) application I am using a required field validator when a submit button is hit. The validator checks the value of txtLatestEnd - which is a hidden text box. The value of this text box is changed via javascript when the user selects an item on the screen before hitting submit. I have noticed that the required field validator is only working in IE, but not chrome or firefox. Could anyone see why this is happening? Thanks again for your help. Listed below is the required field validator\[code\]<asp:RequiredFieldValidator ID="reqLinks" Runat="server" ControlToValidate="txtLatestEnd" Display="Dynamic"EnableClientScript="true" ErrorMessage="Links are required" CssClass="detailrow" Font-Bold="true"></asp:RequiredFieldValidator>\[/code\]edit: if it helps - here is the function on the server side that habndles the button click\[code\]Private Sub btnSave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSave.Click UpdateDatabase()End Sub\[/code\]and here is the button itself.\[code\]<asp:Button Runat="server" ID="btnSave" Text="Save Milestone" CssClass="smalltextbutton"></asp:Button>\[/code\]Both the validator and button are their own table rows in an asp.net table