jQuery.fn.slideshow = function(options) {
    var settings = {
        timeout: '2000',
        type: 'sequence',
        pauselink: null,
        playcallback: null,
        pausecallback: null
    }
    if(options)
        jQuery.extend(settings, options);
    
    var pauseState = 0;
    var current = 1;
    var last = 0;
    var timer = '';
    
    var change = function () {
        if ( pauseState == 0 ) {
            for (var i = 0; i < slides.length; i++) {
                jQuery(slides[i]).css('display', 'none');
            }
            jQuery(slides[last]).css('display', 'block').css('zIndex', '0');
            jQuery(slides[current]).css('zIndex', '1').fadeIn('slow');
            
            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('a').get();
    jQuery.each(slides, function(i){
        jQuery(slides[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;
};