function $$(id){
	 return document.getElementById(id);
}
// 封装函数
helpers = function() {
	 function reg(c){
		  return new RegExp('(\\s|^)'+c+'(\\s|$)');
	 };
	 function hasClass(el,c){
		  return el.className.match(reg(c));};
	 function addClass(el,c){
		  if (!hasClass(el,c)) el.className += " " + c;
	 };
	 function removeClass(el,c) {
		  if (hasClass(el,c)) {
				el.className=el.className.replace(reg(c),' ');
		  }
	 };
	 function addEvent(el,t,f){
		  if(el.addEventListener){
				el.addEventListener(t,f,false);
				return true;
		  }else if(el.attachEvent){
				el.attachEvent('on'+t,f);
				return true;
		  }
		  return false;
	 }
	 return { addClass: addClass,
		  removeClass: removeClass, hasClass: hasClass, addEvent: addEvent }
}();

function tabInit(tabType){
	/* 
	 tabType={
			trigger:'触发事件',
			tabCurrentClass:'当前tab的className',
			delay:'事件触发的延时'
			[,auto:'是否自动播放',
			timer:'自动播放周期']
	 }
	 其后的tab->content对应关系以数组形式添加，以其id为参数识别，如下：
	 [tab1.id,content1.id],[tab2.id,content2.id],......
	 */
	 for(var i=1;i<arguments.length;i++){
		  var arg=arguments;
		  if(arg[i].length>2 && arg[i][2]=='o'){
				helpers.addClass($$(arg[i][0]),tabType.tabCurrentClass);
				$$(arg[i][1]).style.display='block';
		  }else{
				$$(arg[i][1]).style.display='none';
		  }
		  var func=function(i){
					 return function(){
						  c_func = function(){
						  for(var j=1;j<arg.length;j++){
						  helpers.removeClass($$(arg[j][0]),tabType.tabCurrentClass);
						  $$(arg[j][1]).style.display='none';
						  }
						  $$(arg[i][1]).style.display = 'block';
						  helpers.addClass($$(arg[i][0]),tabType.tabCurrentClass);
						  }
						  t_func = setTimeout(c_func,tabType.delay)
						  }
					 };
		  helpers.addEvent($$(arg[i][0]),tabType.trigger,func(i));
		  if(tabType.trigger == 'mouseover' || tabType.auto){
				helpers.addEvent($$(arg[i][0]),'mouseout',function(){
						  clearTimeout(t_func);
						  });
		  }
		  if(tabType.auto){
				helpers.addEvent($$(arg[i][0]),tabType.trigger,function(){clearInterval(changeFunc)});
				helpers.addEvent($$(arg[i][1]),'mouseover',function(){clearInterval(changeFunc)});
				helpers.addEvent($$(arg[i][1]),'mouseout',function(){
						  sNum = watchfunc();
						  changeFunc = setInterval(changeTab,tabType.timer)
						  });
				helpers.addEvent($$(arg[i][0]),'mouseout',function(){
						  sNum = watchfunc();
						  changeFunc = setInterval(changeTab,tabType.timer)
						  });

		  }
	 }
	 //tab切换
	 changeTab = function(){
		  if(sNum==arg.length) sNum=1;
		  func(sNum)();
		  sNum++;
	 }
	 //判断是否开始自动播放
	 if(tabType.auto){
		  sNum = watchfunc();
		  changeFunc = setInterval(changeTab,tabType.timer);

	 }
	 //监听当前激活的tab
	 function watchfunc(){
		  for(var i=1;i<arg.length;i++){
				if(helpers.hasClass($$(arg[i][0]),tabType.tabCurrentClass))
					 return i;
		  }
	 }
}