jQuery.fn.jScrollPane = function(settings)
{
	settings = jQuery.extend(
		{
			scrollbarHeight : 16,
			scrollbarMargin : 0,
			wheelSpeed : 18,
			showArrows : true,
			arrowSize : 14,
			animateTo : false,
			dragMinWidth : 1,
			dragMaxWidth : 99999,
			animateInterval : 100,
			animateStep: 3,
			maintainPosition: true,
			scrollbarOnLeft: false
		}, settings
	);
	return this.each(
		function()
		{
			var $this = jQuery(this);
			
			if (jQuery(this).parent().is('.jScrollPaneContainer')) {
				var currentScrollPosition = settings.maintainPosition ? $this.offset({relativeTo:jQuery(this).parent()[0]}).top : 0;
				var $c = jQuery(this).parent();
				var paneWidth = $this.innerWidth();
				var paneHeight = $this.height();
				var trackWidth = paneWidth;
				jQuery('>.jScrollPaneTrack, >.jScrollArrowUp, >.jScrollArrowDown', $c).remove();
				$this.css({'top':0});
				$c.css({'width':paneWidth+'px'});
			} else {
			var currentScrollPosition = 0;
			var paneWidth = $this.innerWidth();
			var paneHeight = $this.height();
			var trackWidth = paneWidth;
			$this.wrap(
				jQuery('<div></div>').attr(
					{'className':'jScrollPaneContainer'}
				).css({'height':paneHeight+'px', 'width':paneWidth+'px'}));
			}
			
			var cssToApply = {
				'width': paneWidth,
				'height':paneHeight - settings.scrollbarHeight - settings.scrollbarMargin + 'px',
				'borderBottom' : 'none'
			}

			$this.css(cssToApply);

			var contentWidth = longDiv.width();
			var percentInView = paneWidth / contentWidth;

			if (percentInView < .99) {
				var $container = $this.parent();
				$container.append(
					jQuery('<div></div>').attr({'className':'jScrollPaneTrack'}).css({'height':settings.scrollbarHeight+'px'}).append(
						jQuery('<div></div>').attr({'className':'jScrollPaneDrag'}).css({'height':settings.scrollbarHeight+'px'})
					)
				);
				
				var $track = jQuery('>.jScrollPaneTrack', $container);
				var $drag = jQuery('>.jScrollPaneTrack .jScrollPaneDrag', $container);
				
				if (settings.showArrows) {
					
					var currentArrowButton;
					var currentArrowDirection;
					var currentArrowInterval;
					var currentArrowInc;
					var whileArrowButtonDown = function()
					{
						if (currentArrowInc > 4 || currentArrowInc%4==0) {
							positionDrag(dragPosition + currentArrowDirection * mouseWheelMultiplier);
						}
						currentArrowInc ++;
					};
					var onArrowMouseUp = function(event)
					{
						jQuery('html').unbind('mouseup', onArrowMouseUp);
						currentArrowButton.removeClass('jScrollActiveArrowButton');
						clearInterval(currentArrowInterval);
					};
					var onArrowMouseDown = function() {
						jQuery('html').bind('mouseup', onArrowMouseUp);
						currentArrowButton.addClass('jScrollActiveArrowButton');
						currentArrowInc = 0;
						whileArrowButtonDown();
						currentArrowInterval = setInterval(whileArrowButtonDown, 100);
					};
					$container
						.append(
							jQuery('<a></a>')
								.attr({'href':'javascript:;', 'className':'jScrollArrowUp'})
								.html('Scroll up')
								.bind('mousedown', function()
								{
									currentArrowButton = jQuery(this);
									currentArrowDirection = -1;
									onArrowMouseDown();
									this.blur();
									return false;
								}),
							jQuery('<a></a>')
								.attr({'href':'javascript:;', 'className':'jScrollArrowDown'})
								.html('Scroll down')
								.bind('mousedown', function()
								{
									currentArrowButton = jQuery(this);
									currentArrowDirection = 1;
									onArrowMouseDown();
									this.blur();
									return false;
								})
						);
					var $upArrow = jQuery('>.jScrollArrowUp', $container);
					var $downArrow = jQuery('>.jScrollArrowDown', $container);
					if (settings.arrowSize) {
						trackWidth = paneWidth - settings.arrowSize - settings.arrowSize;
						$track
							.css({'width': trackWidth+'px', left:settings.arrowSize+'px'})
					} 
				}
				
				var $pane = jQuery(this).css({'position':'absolute', 'overflow':'visible'});
				
				var currentOffset;
				var maxX;
				var mouseWheelMultiplier;
				// store this in a seperate variable so we can keep track more accurately than just updating the css property..
				var dragPosition = 0;
				var dragMiddle = percentInView*paneHeight/2;
				
				// pos function borrowed from tooltip plugin and adapted...
				var getPos = function (event, c) {
					var p = c == 'X' ? 'Left' : 'Top';
					return event['page' + c] || (event['client' + c] + (document.documentElement['scroll' + p] || document.body['scroll' + p])) || 0;
				};
				
				var ignoreNativeDrag = function() {	return false; };
				
				var initDrag = function()
				{
					ceaseAnimation();
					currentOffset = $drag.offset(false);
					currentOffset.left -= dragPosition;
					maxX = trackWidth - $drag[0].offsetWidth;
					mouseWheelMultiplier = 2 * settings.wheelSpeed * maxX / contentWidth;
				};
				
				var onStartDrag = function(event)
				{
					initDrag();
					dragMiddle = getPos(event, 'X') - dragPosition - currentOffset.left;
					jQuery('html').bind('mouseup', onStopDrag).bind('mousemove', updateScroll);
					if (jQuery.browser.msie) {
						jQuery('html').bind('dragstart', ignoreNativeDrag).bind('selectstart', ignoreNativeDrag);
					}
					return false;
				};
				var onStopDrag = function()
				{
					jQuery('html').unbind('mouseup', onStopDrag).unbind('mousemove', updateScroll);
					dragMiddle = percentInView*paneHeight/2;
					if (jQuery.browser.msie) {
						jQuery('html').unbind('dragstart', ignoreNativeDrag).unbind('selectstart', ignoreNativeDrag);
					}
				};
				var positionDrag = function(destX)
				{
					destX = destX < 0 ? 0 : (destX > maxX ? maxX : destX);
					dragPosition = destX;
					$drag.css({'left':destX+'px'});
					var p = destX / maxX;
					$pane.css({'left':((paneWidth-contentWidth)*p) + 'px'});
					$this.trigger('scroll');
					if (settings.showArrows) {
						$upArrow[destX == 0 ? 'addClass' : 'removeClass']('disabled');
						$downArrow[destX == maxX ? 'addClass' : 'removeClass']('disabled');
					}
				};
				var updateScroll = function(e)
				{
					positionDrag(getPos(e, 'X') - currentOffset.left - dragMiddle);
				};
				
				var dragW = Math.max(Math.min(percentInView*(paneWidth-settings.arrowSize*2), settings.dragMaxWidth), settings.dragMinWidth);

				$drag.css(
					{'width':dragW+'px'}
				).bind('mousedown', onStartDrag);
				
				var trackScrollInterval;
				var trackScrollInc;
				var trackScrollMousePos;
				var doTrackScroll = function()
				{
					if (trackScrollInc > 8 || trackScrollInc%4==0) {
						positionDrag((dragPosition - ((dragPosition - trackScrollMousePos) / 2)));
					}
					trackScrollInc ++;
				};
				var onStopTrackClick = function()
				{
					clearInterval(trackScrollInterval);
					jQuery('html').unbind('mouseup', onStopTrackClick).unbind('mousemove', onTrackMouseMove);
				};
				var onTrackMouseMove = function(event)
				{
					trackScrollMousePos = getPos(event, 'X') - currentOffset.left - dragMiddle;
				};
				var onTrackClick = function(event)
				{
					initDrag();
					onTrackMouseMove(event);
					trackScrollInc = 0;
					jQuery('html').bind('mouseup', onStopTrackClick).bind('mousemove', onTrackMouseMove);
					trackScrollInterval = setInterval(doTrackScroll, 100);
					doTrackScroll();
				};
				
				$track.bind('mousedown', onTrackClick);
				
				var _animateToPosition;
				var _animateToInterval;
				function animateToPosition()
				{
					var diff = (_animateToPosition - dragPosition) / settings.animateStep;
					if (diff > 1 || diff < -1) {
						positionDrag(dragPosition + diff);
					} else {
						positionDrag(_animateToPosition);
						ceaseAnimation();
					}
				}
				var ceaseAnimation = function()
				{
					if (_animateToInterval) {
						clearInterval(_animateToInterval);
						delete _animateToPosition;
					}
				};
				var scrollTo = function(pos, preventAni)
				{
					if (typeof pos == "string") {
						$e = jQuery(pos, this);
						if (!$e.length) return;
						pos = $e.offset().top - $this.offset().top;
					}
					ceaseAnimation();
					var destDragPosition = -pos/(paneWidth-contentWidth) * maxX;
					if (preventAni || !settings.animateTo) {
						positionDrag(destDragPosition);
					} else {
						_animateToPosition = destDragPosition;
						_animateToInterval = setInterval(animateToPosition, settings.animateInterval);
					}
				};
				$this[0].scrollTo = scrollTo;
				
				$this[0].scrollBy = function(delta)
				{
					var currentPos = -parseInt($pane.css('top')) || 0;
					scrollTo(currentPos + delta);
				};
				
				initDrag();
				
				scrollTo(-currentScrollPosition, true);

			} else {
				$this.css(
					{
						'height':'299px',
						'width':paneWidth-this.originalSidePaddingTotal+'px',
						'borderBottom' : '1px solid #000'
					}
				);
				// remove from active list?
			}
			
		}
	)
};