character counter for text content field & excerpt field

    public function excerpt_count_js(){
        echo '<script>jQuery(document).ready(function(){

                if( jQuery("#excerpt").length ) {
                    jQuery("#postexcerpt .handlediv").after("<input type=\'text\' value=\'0\' maxlength=\'3\' size=\'3\' id=\'excerpt_counter\' readonly=\'\' style=\'background:#fff; position:absolute;top:0.2em;right:2em; color:#666;\'>");
                    jQuery("#excerpt_counter").val(jQuery("#excerpt").val().length);
                    jQuery("#excerpt").keyup( function() {
                        jQuery("#excerpt_counter").val(jQuery("#excerpt").val().length);
                    });
                }

                if( jQuery("#wp-word-count").length ) {
                    jQuery("#wp-word-count").after("<td id=\'wp-character-count\'>'. __( 'Character (text only) count:' ) .'<span class=\'character-count\'>0</span></td>");
                }

                if ( jQuery("#content_ifr") ) {

                    $update = function() {
                        tinyMCE.triggerSave();
                        jQuery("#wp-character-count .character-count").html(jQuery("#content").val().length);
                    }

                    setInterval(function() { $update(); }, 1000);

                }
                else {
                    jQuery("#wp-character-count .character-count").html(jQuery("#wp-content-wrap .wp-editor-area").val().length);

                    jQuery("#wp-content-wrap .wp-editor-area").keyup( function() {
                        jQuery("#wp-character-count .character-count").html(jQuery("#wp-content-wrap .wp-editor-area").val().length);
                    });
                }

        });</script>';
    }