/*
	滑动门插件switch tab - http://www.ks-pe.com/tech/switch-demo.html
	@dom
		<div>
		<dl class="tab">
		<dt>
		<a href="#">标题一</a>
		<a href="#">标题二</a>
		</dt>
		<dd>内容一</dd>
		<dd>内容二</dd>
		</dl>
		</div>
	@usage
		$(".tab").switchtab(options);
		$(".tab").switchtab({ defaultindex: "0", effect: "fade", titcell: "dt a", trigger: "click", delaytime: 250 });
	@options
		defaultindex		:0,						//默认选中的标签索引，从0开始
		titonclassname		:"on",					//标签选中时的样式
		titcell				:"dt span",				//自定义标题标签，支持选择符
		maincell			:"dd",					//自定义标题标签，支持选择符
		delaytime			:250,					//延迟触发时间. 当这个时间小于切换动画效果时间时, 动画将被禁用
		intertime			:0,						//自动切换时间. 当这个时间大于0时, 标签将定时自动切换
		trigger				:"click",				//滑动触发方式. 默认为click, 可选择mouseover
		effect				:"fade",				//切换动画. 默认不使用动画. 目前仅提供fade(淡出), slide(向下展开)两种
		omitlinks			:false,					//是否忽略带链接标签，默认为否
		debug				:""						//调试模式. 默认关闭
*/
 jquery.fn.switchtab = function(settings) {
	settings = jquery.extend({//可配置参数
		defaultindex: 0,
		titonclassname: "on",
		titcell: "dt span",
		maincell: ".tabdd",
		delaytime: 250,
		intertime: 0,
		trigger: "click",
		effect: "",
		omitlinks: false,
		debug: "",
		ismap: false
	},
	settings,
	{//插件信息
		version: 120
	});

	this.each(function() {
		var st;
		var curtagindex = -1;
		var obj = jquery(this);
		if(settings.omitlinks){
			settings.titcell = settings.titcell + "[href^='#']";
		}
		var otit = obj.find(settings.titcell);
		var omain = obj.find(settings.maincell);
		var cellcount = otit.length;//可切换个数
		var showstcon = function (oi){
			if(oi != curtagindex || settings.ismap){
				otit.eq(curtagindex).removeclass(settings.titonclassname);
				omain.hide();
				obj.find(settings.titcell + ":eq(" + oi + ")").addclass(settings.titonclassname);
				if(settings.delaytime <250 && settings.effect != "")settings.effect = "";
				if(settings.effect == "fade"){
					obj.find(settings.maincell + ":eq(" + oi + ")").fadein({queue: false, duration: 250});
				}else if(settings.effect == "slide"){
					obj.find(settings.maincell + ":eq(" + oi + ")").slidedown({queue: false, duration: 250});
				}else{
					obj.find(settings.maincell + ":eq(" + oi + ")").show();
				}
				curtagindex = oi;
			}
		};
		
		var shownext = function (){
			otit.eq(curtagindex).removeclass(settings.titonclassname);
			omain.hide();
			if(++curtagindex >= cellcount)curtagindex = 0;
			otit.eq(curtagindex).addclass(settings.titonclassname);
			omain.eq(curtagindex).show();
			//showstcon(curtagindex);
		};
		
		//根据defaultindex初始化
		if(!settings.ismap)
		{
		showstcon(settings.defaultindex);
		}

		//
		if(settings.intertime > 0){
			var sinterval = setinterval(function(){
				shownext();
			}, settings.intertime);
		}

		//处理交互事件
		otit.each(function(i, ele){
			if(settings.trigger=="click"){
				jquery(ele).click(function(){
					showstcon(i);
					return false;//若有链接而选择了click模式, 链接不起作用
				});
			}else if(settings.delaytime > 0){
				jquery(ele).hover(function(){
					st = settimeout(function(){//延时触发
						showstcon(i);
						st = null;
					}, settings.delaytime);
				},function(){
					if(st!=null)cleartimeout(st);
				});
			}else{
				jquery(ele).mouseover(function(){
					showstcon(i);
				});
			}
		});
	});
	if(settings.debug!="")alert(settings[settings.debug]);
	return this;
};