(function($) {                                         
	$.fn.jScrollOfferte = function(o) {
		o = $.extend({
			btnPrev: null,
			btnNext: null,
			btnGo: null,
			mouseWheel: false,
			auto: null,
			hoverPause: false,
	
			speed: 200,
			easing: null,
	
			vertical: false,
			circular: true,
			visible: 2,
			start: 0,
			scroll: 1,
	
			beforeStart: null,
			afterEnd: null
		}, o || {});
	
		return this.each(function() {                           
	
			var running = false, animCss=o.vertical?"top":"left", sizeCss=o.vertical?"height":"width";
			var div = $(this), ul = $("ul", div), tLi = $("li", ul), tl = tLi.size(), v = o.visible;
	
			if(o.circular) {
				ul.prepend(tLi.slice(tl-v+1).clone())
				  .append(tLi.slice(0,o.scroll).clone());
				o.start += v-1;
			}
	
			var li = $("li", ul), itemLength = li.size(), curr = o.start;
			div.css("visibility", "visible");
	
			li.css({overflow: "hidden", float: o.vertical ? "none" : "left"});
			ul.css({margin: "0", padding: "0", position: "relative", "list-style-type": "none", "z-index": "1"});
			div.css({overflow: "hidden", position: "relative", "z-index": "2", left: "0px"});
	
			var liSize = o.vertical ? height(li) : width(li);   //dimensione totale li
			var ulSize = liSize * itemLength;               	//dimensione totale ul    
			var divSize = liSize * v;                          //dimensione del div intero
	
			li.css({width: li.width(), height: li.height()});
			ul.css(sizeCss, ulSize+"px").css(animCss, -(curr*liSize));
	
			div.css(sizeCss, divSize+"px");              //larghezza del div       
	
			if(o.btnPrev) {
				$(o.btnPrev).click(function() {
					return go(curr-o.scroll);
				});
				if(o.hoverPause) {
					$(o.btnPrev).hover(function(){stopAuto();}, function(){startAuto();});
				}
			}
	
	
			if(o.btnNext) {
				$(o.btnNext).click(function() {
					return go(curr+o.scroll);
				});
				if(o.hoverPause) {
					$(o.btnNext).hover(function(){stopAuto();}, function(){startAuto();});
				}
			}
	
			if(o.btnGo)
				$.each(o.btnGo, function(i, val) {
					$(val).click(function() {
						return go(o.circular ? o.visible+i : i);
					});
				});
	
			if(o.mouseWheel && div.mousewheel)
				div.mousewheel(function(e, d) {
					return d>0 ? go(curr-o.scroll) : go(curr+o.scroll);
				});
	
			var autoInterval;
	
			function startAuto() {
			  stopAuto();
			  autoInterval = setInterval(function() {
					  go(curr+o.scroll);
				  }, o.auto+o.speed);
			};
	
			function stopAuto() {
				clearInterval(autoInterval);
			};
	
			if(o.auto) {
				if(o.hoverPause) {
					div.hover(function(){stopAuto();}, function(){startAuto();});
				}
				startAuto();
			};
	
			function vis() {
				return li.slice(curr).slice(0,v);
			};
	
			function go(to) {
				if(!running) {
	
					if(o.beforeStart)
						o.beforeStart.call(this, vis());
					
					if(o.circular) {            
						if(to<0) {          
							ul.css(animCss, -( (curr + tl) * liSize)+"px");
							curr = to + tl;
						} else if(to>itemLength-v) { 
							ul.css(animCss, -( (curr - tl) * liSize ) + "px" );
							curr = to - tl;
						} else curr = to;
					} else {                   
						if(to<0 || to>itemLength-v) return;
						else curr = to;
					}                           
	
					running = true;
					
					ul.animate(
						animCss == "left" ? { left: -(curr*liSize) } : { top: -(curr*liSize) } , o.speed, o.easing,
						function() {
							if(o.afterEnd)
								o.afterEnd.call(this, vis());
							running = false;
						}
					);
					
					//esperimento bottoni
					/*
					if(!o.circular) {
						$(o.btnPrev + "," + o.btnNext).removeClass("disabled");
						$( (curr-o.scroll<0 && o.btnPrev)
							||
						   (curr+o.scroll > itemLength-v && o.btnNext)
							||
						   []
						 ).addClass("disabled");
					}*/
	
				}
				return false;
			};
		});
	};
	
	function css(el, prop) {
		return parseInt($.css(el[0], prop)) || 0;
	};
	function width(el) {
		return  el[0].offsetWidth + css(el, 'marginLeft') + css(el, 'marginRight');
	};
	function height(el) {
		return el[0].offsetHeight + css(el, 'marginTop') + css(el, 'marginBottom');
	};
	
	})(jQuery);