(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, 
                numeric:                false,
                numericId:              'controls'
        }; 

        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(); 
                var clickable = true;
                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.continuous){
                        $("ul", obj).prepend($("ul li:last-child", obj).clone().css("margin-left","-"+ w +"px"));
                        $("ul", obj).append($("ul li:nth-child(2)", obj).clone());
                        $("ul", obj).css('width',(s+1)*w);
                };                              

                if(!options.vertical) $("li", obj).css('float','left');

                if(options.controlsShow){
                        var html = options.controlsBefore;                              
                        if(options.numeric){
                                html += '<ol id="'+ options.numericId +'"></ol>';
                        } else {
                                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);                                                                             
                };

                if(options.numeric){                                                                    
                        for(var i=0;i<s;i++){                                           
                                $(document.createElement("li"))
                                        .attr('id',options.numericId + (i+1))
                                        .html('<a rel='+ i +' href=\"javascript:void(0);\">'+ (i+1) +'</a>')
                                        .appendTo($("#"+ options.numericId))
                                        .click(function(){                                                      
                                                animate($("a",$(this)).attr('rel'),true);
                                        });                                                                                             
                        };                                                      
                } else {
                        $("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 setCurrent(i){
                        i = parseInt(i)+1;
                        $("li", "#" + options.numericId).removeClass("current");
                        $("li#" + options.numericId + i).addClass("current");
                };

                function adjust(){
                        if(t>ts) t=0;           
                        if(t<0) t=ts;   
                        if(!options.vertical) {
                                $("ul",obj).css("margin-left",(t*w*-1));
                        } else {
                                $("ul",obj).css("margin-left",(t*h*-1));
                        }
                        clickable = true;
                        if(options.numeric) setCurrent(t);
                };

                function animate(dir,clicked){
                        if (clickable){
                                clickable = false;
                                var ot = t;                             
                                switch(dir){
                                        case "next":
                                                t = (ot>=ts) ? (options.continuous ? t+1 : ts) : t+1;                                           
                                                break; 
                                        case "prev":
                                                t = (t<=0) ? (options.continuous ? t-1 : 0) : t-1;
                                                break; 
                                        case "first":
                                                t = 0;
                                                break; 
                                        case "last":
                                                t = ts;
                                                break; 
                                        default:
                                                t = dir;
                                                break; 
                                };      
                                var diff = Math.abs(ot-t);
                                var speed = diff*options.speed;                                         
                                if(!options.vertical) {
                                        p = (t*w*-1);
                                        $("ul",obj).animate(
                                                { marginLeft: p }, 
                                                { queue:false, duration:speed, complete:adjust }
                                        );                              
                                } else {
                                        p = (t*h*-1);
                                        $("ul",obj).animate(
                                                { marginTop: p }, 
                                                { queue:false, duration:speed, complete:adjust }
                                        );                                      
                                };

                                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.numeric) setCurrent(0);

                if(!options.continuous && options.controlsFade){                                        
                        $("a","#"+options.prevId).hide();
                        $("a","#"+options.firstId).hide();                              
                };                              

        });

};

})(jQuery);