I think you mean Splash instead of spash.....(Typo??)

Anyways there's an easy way to do this in mobile web forms (easier than the
JavaScript used for this in web forms).

Since it's a splash screen you won't be needing any fancy ASP.NET features
so you don't have to use a mobile web form, instead you can use plain WML.

let's say you'll call your splash screen "splash.wml" the code you'll put in
it will be something like this:

<?xml version="1.0"?>
<!DOCTYPE wml PUBLIC "-//WAPFORUM//DTD WML 1.1//EN"
"http://www.wapforum.org/DTD/wml_1.1.xml">

<wml>

<card id="Splash" title="Welcome!" ontimer="Index.aspx">
<timer value="xxx"/>

<p>
Welcome to my Mobile Site!.
</p>
</card>

</wml>

The trick is the "ontimer" property of the "card" element and the "timer"
element inside the card, in the "value" property xxx is the number of
seconds you want the splash screen to be displayed.

It works fine if you're aiming for WAP devices, if you're not, let me know
and we'll work something in xhtml-mp.

--

Juan David Gomez A.
Microsoft Certified Professional
Analista de Desarrollo - PSL S.A.
Web and Wireless Banking
Medellin - Colombia