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var glume = function(banners_id, focus_id){
	this.$ctn = $('#' + banners_id);
	this.$focus = $('#' + focus_id);
	this.$adLis = null;
	this.$btns = null;
	this.switchSpeed = 5;//自动播放间隔(s)
	this.defOpacity = 1;
	this.crtIndex = 0;
	this.adLength = 0;
	this.timerSwitch = null;
	this.init();
};
glume.prototype = {
	fnNextIndex:function(){
		return (this.crtIndex >= this.adLength-1)?0:this.crtIndex+1;
	},
	//动画切换
	fnSwitch:function(toIndex){
		if(this.crtIndex==toIndex){return;}
		this.$adLis.css('zIndex', 0);
		this.$adLis.filter(':eq('+this.crtIndex+')').css('zIndex', 2);
		this.$adLis.filter(':eq('+toIndex+')').css('zIndex', 1);
		this.$btns.removeClass('on');
		this.$btns.filter(':eq('+toIndex+')').addClass('on');
		var me = this;

		$(this.$adLis[this.crtIndex]).animate({
			opacity: 0
		}, 1000, function() {
			me.crtIndex = toIndex;
			$(this).css({
				opacity: me.defOpacity,
				zIndex: 0
			});
		});
	},
	fnAutoPlay:function(){
		this.fnSwitch(this.fnNextIndex());
	},
	fnPlay:function(){
		var me = this;
		me.timerSwitch = window.setInterval(function() {
			me.fnAutoPlay();
		},me.switchSpeed*1000);
	},
	fnStopPlay:function(){
		window.clearTimeout(this.timerSwitch);
		this.timerSwitch = null;
	},

	init:function(){
		this.$adLis = this.$ctn.children();
		this.$btns = this.$focus.children();
		this.adLength = this.$adLis.length;

		var me = this;
		//点击切换
		this.$focus.on('click', 'a', function(e) {
			e.preventDefault();
			var index = parseInt($(this).attr('data-index'), 10)
			me.fnSwitch(index);
		});
		this.$adLis.filter(':eq('+ this.crtIndex +')').css('zIndex', 2);
		this.fnPlay();

		//hover时暂停动画
		this.$ctn.hover(function() {
			me.fnStopPlay();
		}, function() {
			me.fnPlay();
		});

		if($.browser.msie && $.browser.version < 7) {
			this.$btns.hover(function() {
				$(this).addClass('hover');
			},function() {
				$(this).removeClass('hover');
			});
		}
	}
};
var player1 = new glume('_banners', '_focus');