php if statement

[JWH_Matthew]

I changed my code, now it will only display the iPhone theme on the iPhone if the theme exists. But if it doesn't exist, it just generates a blank page...

does any one know how I could just tell it to set $TEMPLATE == (current theme)???

Thanks.
here is my current code:

Code:

// Check browser, and change theme
function sic_change_theme() {    
   global $TEMPLATE;
   $file = '../theme/iPhone/template.php';
   if (file_exists($file) !== FALSE){
     }
    else
    {
        if (strpos($_SERVER['HTTP_USER_AGENT'], 'iPhone') !== FALSE) {
      $TEMPLATE = 'iPhone';
        }
    }

  
    
}