>>Yes with ASP.NET 2.0 you can use onClientClick.
>>

>><asp:Button id="Help" runat=server Text="Help" onClientClick="window.open('help.htm'); return false;)" />
>>

>
>I do use ASP.NET 2.0. But when I copies and pasted your code into my page, it does not work. What happens is the page seem to be posted back to the server but htm file help.htm is not opening.
>
>Thank you for your suggestion.

Sorry,

I copied an extra parenthesis on the end of your script. You should turn on the script error notification on your browser to alert you to script errors. Try this,

<asp:Button id="Help" runat=server Text="Help" onClientClick="window.open('help.htm'); return false;" />