text area scroll bar custom css

function updatejScrollPaneTextArea(textareaSelector, settings) {
    var textareaClone = $('<div style="word-wrap:break-word" />').appendTo($(textareaSelector).parent());
    var copyAttributes = ['font-family','font-size','font-weight','letter-spacing','word-spacing','line-height','width'];
    for (var i = 0; i < copyAttributes.length; i++) {
        textareaClone.css(copyAttributes[i], $(textareaSelector).css(copyAttributes[i]));
    }
    textareaClone.html('&nbsp;');
    var heightPerRow = textareaClone.height();
    textareaClone.html($(textareaSelector).val().replace(/
/g, '<br />'));
    var overallHeight = textareaClone.height();
    $(textareaSelector).attr('rows', Math.round(overallHeight / heightPerRow));
    $(textareaSelector).css('height', 'auto');
    textareaClone.html($(textareaSelector).val().replace(/
/g, '<br />') + '&nbsp;');
    var cursorPosition = textareaClone.height() - heightPerRow;
    textareaClone.remove();
    var jspAPI = $(textareaSelector).parent().parent().parent();
    var scrollpaneY = jspAPI.data('jsp').getContentPositionY();
    var scrollpaneHeight = $(textareaSelector).parent().parent().parent().height();
    jspAPI.data('jsp').reinitialise(settings);
    if ((cursorPosition + heightPerRow) >= (scrollpaneY + scrollpaneHeight)) {
        jspAPI.data('jsp').scrollToY(scrollpaneY + cursorPosition + heightPerRow - scrollpaneHeight);
    }
    if (cursorPosition <= scrollpaneY) {
        jspAPI.data('jsp').scrollToY(cursorPosition);
    }
}

function jScrollPaneTextArea(textareaSelector, settings) {
    var width = $(textareaSelector).outerWidth();
    var height = $(textareaSelector).outerHeight();
    $(textareaSelector).wrap('<div />');
    $(textareaSelector).parent().css('height', height).css('width', width).css('overflow', 'auto');
    $(textareaSelector).parent().jScrollPane(settings);
    $(textareaSelector).bind('keyup', function() {
        updatejScrollPaneTextArea(textareaSelector, settings);
    });
    $(textareaSelector).bind('click', function() {
        updatejScrollPaneTextArea(textareaSelector, settings);
    });
    updatejScrollPaneTextArea(textareaSelector, settings);
}