var YTabs = function(){
    var D = document, j, len = 0, allTabs;
    return {
        stopEvent: function(evt){
            this.stopPropagation(evt);
            this.preventDefault(evt);
        },
        stopPropagation: function(evt){
            if (evt.stopPropagation) {
                evt.stopPropagation();
            }
            else {
                evt.cancelBubble = true;
            }
        },
        preventDefault: function(evt){
            if (evt.preventDefault) {
                evt.preventDefault();
            }
            else {
                evt.returnValue = false;
            }
        },
        hasClass: function(elem, className){
            var has = new RegExp("(?:^|\\s+)" + className + "(?:\\s+|$)");
            return has.test(elem.className);
        },
        addClass: function(elem, className){
            if (this.hasClass(elem, className)) {
                return;
            }
            elem.className = [elem.className, className].join(" ");
        },
        removeClass: function(elem, className){
            var replace = new RegExp("(?:^|\\s+)" + className + "(?:\\s+|$)", "g");
            if (!this.hasClass(elem, className)) {
                return;
            }
            var o = elem.className;
            elem.className = o.replace(replace, " ");
            if (this.hasClass(elem, className)) {
                this.removeClass(elem, className);
            }
        },
        getByClassName: function(className, tag, rootTag){
            var elems = [], i, tempCnt = document.getElementById(rootTag).getElementsByTagName(tag), len = tempCnt.length;
            for (i = 0; i < len; i++) {
                if (YTabs.hasClass(tempCnt[i], className)) {
                    elems.push(tempCnt[i]);
                }
            }
            if (elems.length < 1) {
                return false;
            }
            else {
                return elems;
            }
        },
        tabs: function(){
            len = arguments.length;
            for (j = 0; j < len; j += 1) {
                allTabs = arguments[j];
                (function(oTabs){
                    var i, tabCnt = (oTabs.tabId) ? D.getElementById(oTabs.tabId) : (oTabs.tabRoot || null), tabs = (oTabs.tTag) ? tabCnt.getElementsByTagName(oTabs.tTag) : (oTabs.tabs || null), contents = (oTabs.cTag) ? tabCnt.getElementsByTagName(oTabs.cTag) : (oTabs.contents || null);
                    if (tabs && contents) {
                        var length = tabs.length, defaultIndex = oTabs.defaultIndex || 0, lastTab = tabs[defaultIndex], hideAll = oTabs.hideAll || false, lastTabClass = oTabs.lastTabClass || '', lastContent = contents[defaultIndex], evtName = oTabs.evt || 'mouseover';
                        if (!hideAll) {
                            YTabs.addClass(lastTab, 'current');
                            lastContent.style.display = 'block';
                        }
                        for (i = 0; i < length; i += 1) {
                            if (i !== defaultIndex) {
                                YTabs.removeClass(tabs[i], 'current');
                                contents[i].style.display = 'none';
                            }
                            tabs[i]['on' + evtName] = function(index){
                                return function(event){
                                    var currentContent = contents[index];
                                    YTabs.removeClass(lastTab, 'current');
                                    YTabs.addClass(this, 'current');
                                    lastContent.style.display = "none";
                                    currentContent.style.display = "block";
                                    lastContent = currentContent;
                                    lastTab = this;
                                    if (evtName === 'click') {
                                        var evt = event || window.event;
                                        YTabs.stopEvent(evt);
                                    }
                                }
                            }(i);
                        }
                    }
                })(allTabs);
            }
        }
    }
}();