Getting a Theme Path from the Controller, (Page Type)

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I have tried using
public function on_start(){
$html = Loader::helper('html');
        $v = View::getInstance();
        $this->addHeaderItem($html->javascript($v->getThemePath().'/js/ios6fix.js'));
//this produces, "concrete/js"
}


I can get the full path by working with the Page Object
$p = Page::getCurrentPage();
        $t = $p->getCollectionThemeObject();
        $themeDir = $t->getThemeURL();
//Produces,http://myurl.com/index.php/themes/mytheme/...


I would like to just use the relative path if I can but can not work out what I need to use(if possible) to display the theme Path

TheRealSean