(function($) {

        $.fn.easySlider = function(options){
          
                // default configuration properties
                var defaults = {                        
                        prevId:                 'prevBtn',
                        prevText:                 'Previous',
                        nextId:                 'nextBtn',        
                        nextText:                 'Next',
                        controlsShow:        true,
                        controlsBefore:        '',
                        controlsAfter:        '',        
                        controlsFade:        true,
                        firstId:                 'firstBtn',
                        firstText:                 'First',
                        firstShow:                false,
                        lastId:                 'lastBtn',        
                        lastText:                 'Last',
                        lastShow:                false,                                
                        vertical:                false,
                        speed:                         800,
                        auto:                        false,
                        pause:                        2000,
                        continuous:                false
                }; 
                
                var options = $.extend(defaults, options);  
                                
                this.each(function() {  
                        var obj = $(this);                                 
                        var s = $("li", obj).length;
                        var w = $("li", obj).width(); 
                        var h = $("li", obj).height(); 
                        obj.width(w); 
                        obj.height(h); 
                        obj.css("overflow","hidden");
                        var ts = s-1;
                        var t = 0;
                        $("ul", obj).css('width',s*w);                        
                        if(!options.vertical) $("li", obj).css('float','left');
                        
                        if(options.controlsShow){
                                var html = options.controlsBefore;
                                if(options.firstShow) html += '<span id="'+ options.firstId +'"><a href=\"javascript:void(0);\">'+ options.firstText +'</a></span>';
                                html += ' <span id="'+ options.prevId +'"><a href=\"javascript:void(0);\">'+ options.prevText +'</a></span>';
                                html += ' <span id="'+ options.nextId +'"><a href=\"javascript:void(0);\">'+ options.nextText +'</a></span>';
                                if(options.lastShow) html += ' <span id="'+ options.lastId +'"><a href=\"javascript:void(0);\">'+ options.lastText +'</a></span>';
                                html += options.controlsAfter;                                                
                                $(obj).after(html);                                                                                
                        };
        
                        $("a","#"+options.nextId).click(function(){                
                                animate("next",true);
                        });
                        $("a","#"+options.prevId).click(function(){                
                                animate("prev",true);                                
                        });        
                        $("a","#"+options.firstId).click(function(){                
                                animate("first",true);
                        });                                
                        $("a","#"+options.lastId).click(function(){                
                                animate("last",true);                                
                        });                
                        
                        function animate(dir,clicked){
                                var ot = t;                                
                                switch(dir){
                                        case "next":
                                                t = (ot>=ts) ? (options.continuous ? 0 : ts) : t+1;                                                
                                                break; 
                                        case "prev":
                                                t = (t<=0) ? (options.continuous ? ts : 0) : t-1;
                                                break; 
                                        case "first":
                                                t = 0;
                                                break; 
                                        case "last":
                                                t = ts;
                                                break; 
                                        default:
                                                break; 
                                };        
                                
                                var diff = Math.abs(ot-t);
                                var speed = diff*options.speed;                                                
                                if(!options.vertical) {
                                        p = (t*w*-1);
                                        $("ul",obj).animate(
                                                { marginLeft: p }, 
                                                speed
                                        );                                
                                } else {
                                        p = (t*h*-1);
                                        $("ul",obj).animate(
                                                { marginTop: p }, 
                                                speed
                                        );                                        
                                };
                                
                                if(!options.continuous && options.controlsFade){                                        
                                        if(t==ts){
                                                $("a","#"+options.nextId).hide();
                                                $("a","#"+options.lastId).hide();
                                        } else {
                                                $("a","#"+options.nextId).show();
                                                $("a","#"+options.lastId).show();                                        
                                        };
                                        if(t==0){
                                                $("a","#"+options.prevId).hide();
                                                $("a","#"+options.firstId).hide();
                                        } else {
                                                $("a","#"+options.prevId).show();
                                                $("a","#"+options.firstId).show();
                                        };                                        
                                };                                
                                
                                if(clicked) clearTimeout(timeout);
                                if(options.auto && dir=="next" && !clicked){;
                                        timeout = setTimeout(function(){
                                                animate("next",false);
                                        },diff*options.speed+options.pause);
                                };
                                
                        };
                        // init
                        var timeout;
                        if(options.auto){;
                                timeout = setTimeout(function(){
                                        animate("next",false);
                                },options.pause);
                        };                
                
                        if(!options.continuous && options.controlsFade){                                        
                                $("a","#"+options.prevId).hide();
                                $("a","#"+options.firstId).hide();                                
                        };                                
                        
                });
          
        };

})(jQuery);