/*
 * jQuery Slideshow Plugin v1.3
 * Author: Matt Oakes
 * URL: http://www.matto1990.com/jquery/slideshow/
 *
 * Modifications by Meinhard Benn (http://benn.org/):
 *  - fadetime setting
 */

jQuery.fn.slideshow = function (options) {
    var settings = {
        fadetime: 'slow',
        timeout: '2000',
        type: 'sequence',
        pauselink: null,
        playcallback: null,
        pausecallback: null
    };
    if (options) {
        jQuery.extend(settings, options);
    }

    var pauseState = 0,
		current = 1,
		last = 0,
		timer = '';

    var change = function () {
        if (pauseState == 0) {
            for (var i = 0; i < slides.length; i++) {
                if (slides.length > 1)
                    jQuery(divs[i]).fadeOut(settings.fadetime); //.css('display', 'none');
                jQuery(divs[i]).removeClass('active');
            }
            if (slides.length < 2)
                jQuery(divs[last]).css('display', 'block').css('zIndex', '1');
            else jQuery(divs[last]).css('zIndex', '0');

            //jQuery(divs[current]).addClass('active');
            jQuery(divs[current]).css('zIndex', '1').fadeIn(settings.fadetime);
            

            if (settings.type == 'sequence') {
                if ((current + 1) < slides.length) {
                    current = current + 1;
                    last = current - 1;
                }
                else {
                    current = 0;
                    last = slides.length - 1;
                }
            }
            else if (settings.type == 'random') {
                last = current;
                while (current == last) {
                    current = Math.floor(Math.random() * (slides.length));
                }
            }
            else {
                alert('type must either be \'sequence\' or \'random\'');
            }
            timer = setTimeout(change, settings.timeout);
        }
    };

    var pause = function () {
        if (pauseState == 0) {
            pauseState = 1;
            clearTimeout(timer);
            if (settings.playcallback != null) {
                settings.pausecallback(jQuery('#' + settings.pauselink));
            }
        }
        else {
            pauseState = 0;
            change();
            if (settings.playcallback != null) {
                settings.playcallback(jQuery('#' + settings.pauselink));
            }
        }
        return false;
    };

    this.css('position', 'relative');
    var slides = this.find('img').get();
    var divs = this.find('div').get();

    jQuery.each(slides, function (i) {
        jQuery(divs[i]).css('zIndex', slides.length - i).css('position', 'absolute').css('top', '0').css('left', '0');
    });
    if (settings.type == 'sequence') {
        timer = setTimeout(change, settings.timeout);
    }
    else if (settings.type == 'random') {
        do {
            current = Math.floor(Math.random() * (slides.length));
        } while (current == 0);
        timer = setTimeout(change, settings.timeout);
    }
    else {
        alert('type must either be \'sequence\' or \'random\'');
    }

    if (settings.pauselink != null) {
        jQuery('#' + settings.pauselink).click(pause);
    }

    return this;
};