EN.registerModule("tabNav", {
        onDomReady:function() { 
                            
                var links = document.getElementById("letter-nav").getElementsByTagName('a');
                              
                for(var i = 0, lnk; lnk = links[i]; i++) {
                        lnk.onclick = function(e) {
                                
                                var links = document.getElementById("letter-nav").getElementsByTagName('a'),
                                    ul;
                                
                                for(var i = 0, lnk; lnk = links[i]; i++) {
                                        lnk.className = lnk.className.replace(/ui-tab-active/, '');
                                        ul = document.getElementById(lnk.href.substring(lnk.href.indexOf('#')+1));
                                        ul.style.display = "none";
                                };
                                
                                ul = document.getElementById(this.href.substring(this.href.indexOf('#')+1));
                                ul.style.display = "block";
                                
                                this.className += " ui-tab-active";  
                                
                                return false;     
                        };
                };
                
                
        }
});