Howto dynamically switch default template for mobile device?

[jackrabbit]

I have a script in my template to show different stylesheet to mobile devices but I want to entirely switch the default template to one specifically created for mobile phones.

Here is what I have tried in my default template. Note that this is just my idea of what I want to achieve
<?php defined( '_JEXEC' ) or die ( 'Restricted access' );
$template =& JFactory::getTemplate();

include_once './templates/devices.php';
$browser = new Browser();
if( $browser->getBrowser() == Browser::BROWSER_IPHONE) {
$template = ('mobile');
} else {
show joomla default template for desktop
}

It seems the detection really should be done in index2.php but that only caused errors. Please suggest options.

[jackrabbit]

I tried redirection and it does return the template but it is stuck on the home page, naturally because it keeps see the same command. How can I do this correctly? Do I need to use a cookie?

include_once './templates/devices.php';
$browser = new Browser();
if( $browser->getBrowser() == Browser::BROWSER_IPHONE) {
header(location:index.php?template=mobile)
}