OK! I've just solved this problem!
Use <mobile:devicespecific> and <scripttemplate>. Following code
demonstrates it:
<mobile

eviceSpecific id="DeviceSpecific1" runat="server">
<choice filter="isHTML32"
xmlns="http://schemas.microsoft.com/mobile/html32template">
<scripttemplate>
<frameset border="0" rows="*,20">
<frame src="Content.aspx" scrolling="auto"
name="Content"></frame>
<frame src="Navigation.aspx" scrolling="no"></frame>
</frameset>
</scripttemplate>
</choice>
</mobile

eviceSpecific>
Best regards, Roman Ogolikhin.