jQuery.fn.accordion = function(options) {
    // options
    var SLIDE_DOWN_SPEED = 'slow';
    var SLIDE_UP_SPEED = 'fast';
    var startClosed = options && options.start && options.start == 'closed';
    var on = options && options.on && (typeof options.on == 'number' && options.on > 0) ? options.on - 1 : 0;
    return this.each(function() {
        jQuery(this).addClass('accordion'); // use to activate styling
        jQuery(this).find('p').hide();
        jQuery(this).find('h2').click(function() {


            var current = jQuery(this.parentNode).find('p:visible');
            var next = jQuery(this).find('+p');

            if (current[0] != next[0]) {
                current.slideUp(SLIDE_UP_SPEED);

            } 
            if (next.is(':visible')) {
                next.slideUp(SLIDE_UP_SPEED);

            } else {
                next.slideDown(SLIDE_DOWN_SPEED);

            }
        });
        if (!startClosed) {
            jQuery(this).find('p:eq(' + on + ')').slideDown(SLIDE_DOWN_SPEED);
        }
    });
};