(function($){                                          
$.fn.scrollContent = function(instanceSettings) {
	
	var shortcut =  $.fn.scrollContent;
	
	shortcut.defaultsSettings = {
	scrollType:'button', // button or slider
		btnPrev: null,
		btnNext: null,
		btnSpecific: null,
		auto: null,
		speed: 200,
		easing: null,
		vertical: 0,
		circular: 1,
		visible: 1,
		start: 0,
		scrollAtATime: 1,
		beforeStart: null,
		afterEnd: null
	};
	
	var settings = $.extend({}, $.fn.scrollContent.defaultsSettings , instanceSettings || {});

	return this.each(function() {                           // Returns the element collection. Chainable.

		var running = false;
		var animCss = settings.vertical?"top":"left";
		var sizeCss = settings.vertical?"height":"width";
		var div = $(this);
		var ul = $("ul", div);
		var tLi = $("li", ul);
		var tl = tLi.size();
		var v = settings.visible;

		if(settings.circular) {
				ul.prepend(tLi.slice(tl-v-1+1).clone())
					.append(tLi.slice(0,v).clone());
				settings.start += v;
		}

		var li = $("li", ul);
		var itemLength = li.size();
		var curr = settings.start;
		div.css("visibility", "visible");

		li.css({overflow: "hidden", float: settings.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 = settings.vertical ? height(li) : width(li);   // Full li size(incl margin)-Used for animation
		var ulSize = liSize * itemLength;                   // size of full ul(total length, not just for the visible items)
		var divSize = liSize * v;                           // size of entire div(total length for just the visible items)

		li.css({width: li.width(), height: li.height()});
		ul.css(sizeCss, ulSize+"px").css(animCss, -(curr*liSize));

		div.css(sizeCss, divSize+"px");                     // Width of the DIV. length of visible images

		if(settings.btnPrev){
			$(settings.btnPrev).click(function() {
					return go(curr-settings.scrollAtATime);
			});
		}

		if(settings.btnNext){
			$(settings.btnNext).click(function() {
					return go(curr+settings.scrollAtATime);
			});
		}

		if(settings.btnSpecific){
			$.each(settings.btnSpecific, function(i, val) {
				$(val).click(function() {
					return go(settings.circular ? settings.visible+i : i);
				});
			});
		}

		if(settings.auto){
			setInterval(function() {
					go(curr+settings.scrollAtATime);
			}, settings.auto+settings.speed);
		}

		function vis() {
			return li.slice(curr).slice(0,v);
		}

		function go(to) {
			if(!running) {

				if(settings.beforeStart){
					settings.beforeStart.call(this, vis());
				}
		
				if(settings.circular) { // If circular we are in first or last, then goto the other end
						if(to<=settings.start-v-1) {           // If first, then goto last
								ul.css(animCss, -((itemLength-(v*2))*liSize)+"px");
								// If "scroll" > 1, then the "to" might not be equal to the condition; it can be lesser depending on the number of elements.
								curr = to==settings.start-v-1 ? itemLength-(v*2)-1 : itemLength-(v*2)-settings.scrollAtATime;
						} else if(to>=itemLength-v+1) { // If last, then goto first
								ul.css(animCss, -( (v) * liSize ) + "px" );
								// If "scroll" > 1, then the "to" might not be equal to the condition; it can be greater depending on the number of elements.
								curr = to==itemLength-v+1 ? v+1 : v+settings.scrollAtATime;
						} else { curr = to;}
				} else {                    // If non-circular and to points to first or last, we just return.
					if(to<0 || to>itemLength-v){ 
						return;
					}else{ 
						curr = to;
					}
				}                           // If neither overrides it, the curr will still be "to" and we can proceed.

				running = true;
			
				// custom animate
				var oldSlider = $(li[curr-1]).find('div.slider');
				
				var currClassBG = $(li[curr]).attr("rel");
				var lastClassBG = jQuery(".TopBanner").attr('class');
				var prevClassBG = lastClassBG.substr(lastClassBG.indexOf(" ")+1, lastClassBG.length-1);
			
				
				var currNavId = $(li[curr]).find('div.slider').attr("rel");
				$(".navigation_control a").removeClass("current");
				$(currNavId).addClass("current");
				
				oldSlider.animate(
					{marginLeft: '-1000px'},
					settings.speed/10,
					settings.easing,
					function() {
						jQuery(".TopBanner").removeClass(prevClassBG);
						jQuery(".TopBanner").addClass(currClassBG);
						ul.animate(
							animCss == "left" ? { left: -(curr*liSize) } : { top: -(curr*liSize) } ,
							settings.speed/10,
							settings.easing,
							function() {
								oldSlider.css("marginLeft", 0);
								if(settings.afterEnd){
									settings.afterEnd.call(this, vis());
								}
								running = false;
							}
						);
					}
				);
				
				// Disable buttons when the carousel reaches the last/first, and enable when not
				if(!settings.circular) {
					$(settings.btnPrev + "," + settings.btnNext).removeClass("disabled");
					$( (curr-settings.scrollAtATime<0 && settings.btnPrev)||(curr+settings.scrollAtATime > itemLength-v && settings.btnNext)||[]).addClass("disabled");
				}

			}
			return false;
		}
  });
};

function css(el, prop) {
    return parseInt($.css(el[0], prop)) || 0;
};

function width(el) {
    return  el.outerWidth() + css(el, 'marginLeft') + css(el, 'marginRight');
}
function height(el) {
    return el.outerHeight() + css(el, 'marginTop') + css(el, 'marginBottom');
}

})(jQuery);