text area content is not resize after install Qtranslate!!!!!!

text area content is not resize after install Qtranslate!!!!!!

in functions.php
add

add_action(‘admin_head’, ‘content_textarea_height’);
function content_textarea_height() {
echo’
<style type=”text/css”>
/*height text area for QTRANSLATE */
#qtrans_textarea_content_ifr { min-height:450px !important;
</style>
‘;
}