/**
 * tab (Version 1.3)
 * @author lv ming (akm107@163.com)
 *
 * Create a Tab
 * @example new Tab(container, options);
 * on Jquery
 *
 */
function Tab(container, options, callback){
	this.container=$(container);
	this.handle=$(container+' .J_tab_nav li');
	this.panel=$(container+' .J_tab_panel');
	this.count=this.handle.length;
	this.timer=null;
	this.eTime=null;
	this.options=$.extend({
		auto:false,
		delay:4,
		event:'mouseover',
		index:1
		},options);
	this.init();
	if(callback){
		callback.call(this);
		}
	}
Tab.prototype={
	init:function(){
		var that=this,
			count=this.count, op=this.options, auto=!!op.auto;
		this.handle.bind(op.event, function(){
			that._trigger(this);
			});
		if(op.index==='r'){
			op.index=this._random(count)
			}
		this._show(op.index);
		if(auto){
			this._auto();
			this.container.hover(function(){that._stop();},function(){that._auto();});
			}
		},
	_random:function(max){
		return parseInt(Math.random() * max + 1);
		},
	_trigger:function(o){
		var index, op=this.options, handle=this.handle;
		if(op.index===(handle.index(o)+1)){
			return;
			}
		index=op.index=handle.index(o)+1;
		this._show(index);
		},
	_show:function(i){
		this.handle.removeClass('cur').eq(i-1).addClass('cur');
		this.panel.addClass('none').eq(i-1).removeClass('none');
		},
	_auto:function(){
		var that=this,
			op=that.options;
		this.timer=setTimeout(function(){
			op.index = op.index< that.count? ++op.index: 1;
			that._show(op.index);
			that._auto();
			},op.delay*1000);
		},
	_stop:function(){
		clearTimeout(this.timer);
		}
	};