How to configure Wordpress to be able to use <script> tag inside posts?

Question

I'm looking for a solution that would allow me to write tags inside posts and be sure that the visual editor or wordpress will not alter them.

The same problem can apply for other specific HTML code that I may want to use.

Disabling the visual editor is not an option, because in will render most edit operation too hard to use.

Answer 1

Add the following to your theme functions.php:

function fb_change_mce_options($initArray) {
    $ext = 'script[charset|defer|language|src|type]';

    if ( isset( $initArray['extended_valid_elements'] ) ) {
        $initArray['extended_valid_elements'] .= ',' . $ext;
    } else {
        $initArray['extended_valid_elements'] = $ext;
    }

    return $initArray;
}
add_filter('tiny_mce_before_init', 'fb_change_mce_options');