jQuery Plugin to apply a 'smallcaps' effect to text

jquery.smallcaps.js

/*!
 * jQuery SmallCaps
 * 
 * Demo: https://jsfiddle.net/jbuncle/9wwrkbrf/
 *
 * Copyright 2013 James Buncle
 * 
 * Released under the MIT license.
 * http://jquery.org/license
 *
 */
(function($) {
    $.fn.smallCaps = function() {
        $.each($(this).contents(), function(index, obj) {
            processNode(obj);
        });
        return this;
    };
    function processNode(element) {
        if (element.nodeType === 3) {
            var text = element.textContent;
            if (text !== undefined) {
                if (text.trim().length > 0) {
                    var newText = convertText(text);
                    $(element).replaceWith(newText);
                    $(element).css({
                        border: '0 none'
                    });
                }
            }
        }
    }
    function convertText(text) {
        var fontSize = "0.7em";
        var newText = "";

        var currUppers = "";
        var currLowers = "";
        var charIndex;
        for (charIndex = 0; charIndex < text.length; charIndex++) {
            var currChar = text.charAt(charIndex);
            if (isUpper(currChar)) {
                if (currLowers !== "") {
                    newText += wrapLower(currLowers, fontSize);
                    currLowers = "";
                }
                currUppers += currChar;
            } else {
                if (currUppers !== "") {
                    newText += wrapUpper(currUppers, fontSize);
                    currUppers = "";
                }
                currLowers += currChar;
            }
        }
        if (currLowers !== '') {
            newText += wrapLower(currLowers);
        }
        //Wrap up remainder
        if (currUppers !== '') {
            newText += wrapUpper(currUppers);
        }
        return newText;
    }
    function isUpper(character) {
        return character.toUpperCase() === character;
    }
    function wrapUpper(text) {
        return "<div style='display:inline;font-size:1em;'>" + text + "</div>";
    }
    function wrapLower(text, size) {
        return "<div style='display:inline;font-size:0.7em;text-transform: uppercase'>" + text + "</div>";
    }
    function hasChildren($obj) {
        return $obj.length > 0;
    }
})(jQuery);