[WordPress] Mobile Theme Switcher + IPad View

index.php

<?php

/*
Plugin Name: Mobile Theme Switch
Description: Switches WordPress theme based on user agent
*/

session_start();
if($_GET['mobile'] == "off"){
    $_SESSION[$mobilethemeswitch] = "off"; 
} else if($_GET['mobile'] == "on"){
    $_SESSION[$mobilethemeswitch] = "on";
}

//mobile browsers
$iphone = strpos($_SERVER['HTTP_USER_AGENT'],"iPhone");
$ipod = strpos($_SERVER['HTTP_USER_AGENT'],"iPod");
$android = strpos($_SERVER['HTTP_USER_AGENT'],"Android");
$ipad = strpos($_SERVER['HTTP_USER_AGENT'],'iPad');
$palmpre = strpos($_SERVER['HTTP_USER_AGENT'],"webOS");
$berry = strpos($_SERVER['HTTP_USER_AGENT'],"BlackBerry");
$iemobile = ( strpos($_SERVER['HTTP_USER_AGENT'],"iemobile") || strpos($_SERVER['HTTP_USER_AGENT'],"IEMobile") );

if ((($iphone || $android || $palmpre || $berry || $ipod || $iemobile) == $_SERVER['HTTP_USER_AGENT'])) { 
    add_filter('stylesheet', 'mobile');
    add_filter('template', 'mobile');
} 
if ((($ipad) == $_SERVER['HTTP_USER_AGENT']) ){
    add_filter('stylesheet', 'mobilePad');
    add_filter('template', 'mobilePad');
}
function mobile(){
    $mobiletheme =  ' MOBILE PHONE TEMPLATE ';
    $themes = get_themes();
    foreach ($themes as $theme_data) {
      if ($theme_data['Name'] == $mobiletheme) {
          return $theme_data['Stylesheet'];
      }
    }   
}
function mobilePad(){
    $mobiletheme =  ' IPAD TEMPLATE HERE ';
    $themes = get_themes();
    foreach ($themes as $theme_data) {
      if ($theme_data['Name'] == $mobiletheme) {
          return $theme_data['Stylesheet'];
      }
    }   
}

?>