/**
 * jCarouselFade - Simple addition to Jan Sorgalla's jCarousel
 *   http://www.kelvinluck.com/assets/jquery/jCarouselFade
 *
 * Copyright (c) 2006 Kelvin Luck (http://www.kelvinluck.com)
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 *
 * Built on top of the jQuery library
 *   http://jquery.com
 * And jCarousel
 *   http://sorgalla.com/jcarousel/
 */
$.jCarouselFade = function()
{
	// the number of milliseconds to spend fading in:
	var fadeInTime = 1000;
	// the number of milliseconds to spend fading out:
	var fadeOutTime = 200;
	
	return {
		beforeAnimationHandler : function(carousel, first, last, prevFirst, prevLast, size)
		{
			if (prevFirst == 0) {
				// first time this is called, set the opacity of all above the field of view to none.
				for (var i=last+1; i<=size; i++) {
					carousel.get(i).css({opacity:.01});
				}
			}
			if (first < prevFirst) {
				for (var i=first; i<prevFirst; i++) {
					carousel.get(i).animate({opacity:1}, fadeInTime);
				}
			} else {
				for (var i=prevFirst; i<first; i++) {
					carousel.get(i).animate({opacity:.01}, fadeOutTime);
				}
			}
			if (last < prevLast) {
				for (var i=last+1; i<=prevLast; i++) {
					carousel.get(i).animate({opacity:.01}, fadeOutTime);
				}
			} else {
				for (var i=prevLast+1; i<=last; i++) {
					carousel.get(i).animate({opacity:1}, fadeInTime);
				}
			}
			return;
		}
	}
}();
$.fn.jCarouselFade = function(configObject)
{
	if (configObject.beforeAnimationHandler) {
		// preserve existing handler
		var oldBeforeAnimationHandler = configObject.beforeAnimationHandler;
		configObject.beforeAnimationHandler = function()
		{
			oldBeforeAnimationHandler();
			$.jCarouselFade.beforeAnimationHandler();
		};
	} else {
		configObject.beforeAnimationHandler = $.jCarouselFade.beforeAnimationHandler;
	}
	
	return this.each(function() {
		var jc = new jQuery.jcarousel(this, configObject);
    });
}