/**
 * @author Stéphane Roucheray
 * @extends jquery
 */
jQuery.fn.carousel = function(previous, next, options) {
    var sliderList = jQuery(this).children()[0];
    if (this && sliderList) {
        var increment = jQuery(sliderList).children().outerWidth("true"),
                elmnts = jQuery(sliderList).children(),
                numElmts = elmnts.length,
                sizeFirstElmnt = increment,
                shownInViewport = Math.round(jQuery(this).width() / sizeFirstElmnt),
                firstElementOnViewPort = 1,
                isAnimating = false;
        for (i = 0; i < shownInViewport; i++) {
            jQuery(sliderList).css('width', (numElmts + shownInViewport) * increment + "px");
            jQuery(sliderList).append(jQuery(elmnts[i]).clone());
        }
        jQuery(previous).click(function(event) {
            if (!isAnimating) {
                if (firstElementOnViewPort == 1) {
                    jQuery(sliderList).css('left', "-" + numElmts * sizeFirstElmnt + "px");
                    firstElementOnViewPort = numElmts;
                } else {
                    firstElementOnViewPort--;
                }
                jQuery(sliderList).animate({
                    left: "+=" + increment,
                    y: 0,
                    queue: true
                }, "swing", function() {
                    isAnimating = false;
                });
                isAnimating = true;
            }
        });
        jQuery(next).click(function(event) {
            if (!isAnimating) {
                if (firstElementOnViewPort > numElmts) {
                    firstElementOnViewPort = 2;
                    jQuery(sliderList).css('left', "0px");
                } else {
                    firstElementOnViewPort++;
                }
                jQuery(sliderList).animate({
                    left: "-=" + increment,
                    y: 0,
                    queue: true
                }, "swing", function() {
                    isAnimating = false;
                });
                isAnimating = true;
            }
        });
    }
};