Textbox shows WaterMarkText of TextBoxWatermarkExtender if I press alt + tab in Mozilla
<p>here is my code ...
Its work fine if I am on same page but if my focus is on accountinginfo textbox and I pressed the "alt + tab" (swith the window) then if I come to the same page the textbox shows the WaterMarkText in textbox (with focus) i.e. with textbox CSS</p>

<pre><code>&lt;asp:TextBox ID="accountinginfo" runat="server" TextMode="MultiLine" Width="450px" Height="80" CssClass="textfield100percaps"&gt;&lt;/asp:TextBox&gt;

&lt;act:TextBoxWatermarkExtender ID="accinfo" runat="server" TargetControlID="accountinginfo" Enabled="true" WatermarkText="Accounting Information" WatermarkCssClass="watermarkOn" /&gt;
</code></pre>
