/**
 * @author Stéphane Roucheray 
 * @extends jquery
 */


jQuery.fn.carousel = function(previous, next, options, automate) {
    var sliderList = jQuery(this).children()[0];

    if (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 + increment + "px");
            jQuery(sliderList).append(jQuery(elmnts[i]).clone());
        }

        //Assign a timer, so it will run periodically
        if (automate) {
            var fncall = "newsslider('" + next + "')";
            var run = setInterval(fncall, 5000);
        }
        
        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;

                var indx = firstElementOnViewPort;
                if (firstElementOnViewPort > numElmts) {
                    indx = 1;
                }

            }

        });

        jQuery(next).click(function(event) {
            if (!isAnimating) {

                if (firstElementOnViewPort > numElmts) {
                    firstElementOnViewPort = 2;
                    jQuery(sliderList).css('left', "0px");

                }

                else {

                    firstElementOnViewPort++;

                }
                var indx = firstElementOnViewPort;
                if (firstElementOnViewPort > numElmts) {
                    indx = 1;
                }

                jQuery(sliderList).animate({
                    left: "-=" + increment,
                    y: 0,
                    queue: true
                }, "swing", function() { isAnimating = false; });
                isAnimating = true;

            }

        });



    }


};


function newsslider(next) {
    $(next).click();
}