$.fn.extend({
    opacity: function(options){
        var o = {
            loop: '',
            controls: '',
            speed: '',
            gap: 500,
            conClass: ''
        };
        $.extend(o,options);
        
        var loops = $(o.loop,this), controls = $(o.controls);
        
        if(loops.length < 2) return;
        
        loops.filter(':not(:first)').css('opacity', '0');
        
        var that = this;
        
        var method = {
            timer: null,
            
            star: function(n){
                
                method.timer = setInterval(function(){
                    method.play(n);
                    
                },o.gap);
                
            },
            
            play: function(n){
                var current = method.getCurrent(),
                    next = method.getNext(n);
                
                loops.stop(true,true);
                                    
                current.animate({ opacity: 0},o.speed,'linear',function(){
					$(this).removeClass('on');
					$(this).addClass('hidden');
				});
                
                next.animate({ opacity: 1},o.speed,'linear',function(){
					$(this).removeClass("hidden");
					$(this).siblings().each(function(){$(this).addClass("hidden");});
					$(this).addClass('on');
				});
                
                controls.removeClass(o.conClass);
                controls.eq(next.index()).addClass(o.conClass);
            },
            
            stop: function(){
                clearInterval(method.timer);
            },
            
            getCurrent: function(){
                return loops.filter('.on');
            },
            
            getNext: function(n){
                if(n) return n;
                
                var c = method.getCurrent(),
                    nn = c.next();
                
                if(!nn.length) nn = loops.first();
                
                return nn;
            }
        };
        
        method.star();
        
        this.hover(
            function(){
                method.stop()
            },
            function(){
                method.star()
            }
        )
        
        var bTimer = null;
        
        controls.live('mouseenter',function(e){
            bTimer = setTimeout(function(){
                
                var target = $(e.currentTarget);
                
                if(target.is('.'+o.conClass)) return;
                
                var next = loops.eq(target.index());
                
                method.play(next);
            },o.speed);
        });
        
        controls.live('mouseleave',function(e){
            clearTimeout(bTimer);
        });
    }
})