Add script tag in WordPress

        add_filter('tiny_mce_before_init', 'esw_tiny_mce_before_init');
        function esw_tiny_mce_before_init($o) {
            # http://forum.semiologic.com/discussion/4807/iframe-code-disappears-switching-visualhtml/
            # http://wiki.moxiecode.com/index.php/TinyMCE:Configuration/valid_elements#Full_XHTML_rule_set
            # assume the stuff below is properly set if they exist already

            if ( current_user_can('publish_posts') ){

                if ( !isset($o['extended_valid_elements']) ){
                    $elts = array();

                    $elts[] = "iframe[align<bottom?left?middle?right?top|class|frameborder|height|id"
                        . "|longdesc|marginheight|marginwidth|name|scrolling<auto?no?yes|src|style"
                        . "|title|width]";

                    $elts = implode(',', $elts);

                    $o['extended_valid_elements'] = $elts;

                }
            }
            else{
                if ( !isset($o['invalid_elements']) ){
                    $elts = array();

                    $elts[] = "iframe";
                    $elts[] = "script";

                    $elts = implode(',', $elts);

                    $o['invalid_elements'] = $elts;
                }
            }

            return $o;
        }

        //add_filter( 'user_has_cap', 'esw_author_cap_filter', 10, 3 );
        add_filter( 'wp_kses_allowed_html', 'esw_author_cap_filter_tags',1,1 );
        function esw_author_cap_filter_tags( $allowedposttags ) {


            if ( !current_user_can( 'publish_posts' ) )
                return $allowedposttags;

            $allowedposttags['iframe']=array(
                'align' => true,
                'width' => true,
                'height' => true,
                'frameborder' => true,
                'name' => true,
                'src' => true,
                'id' => true,
                'class' => true,
                'style' => true,
                'scrolling' => true,
                'marginwidth' => true,
                'marginheight' => true,
                );
            $allowedposttags['code']=array();
            return $allowedposttags;
        }

        add_filter( 'safe_style_css', 'esw_author_cap_filter_css',1,1 );
        function esw_author_cap_filter_css( $allowedpostcss ) {
            $allowedpostcss[]='display';
            return $allowedpostcss;
        }