jQuery.fn.accordion = function(options) {
    // options
    var SLIDE_DOWN_SPEED = 'slow';
    var SLIDE_UP_SPEED = 'slow';
    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('dd').slideUp(SLIDE_UP_SPEED);
 
      	jQuery(this).find('dt').click(function() {
      	
         	var current = jQuery(this.parentNode).find('dd:visible');
            var next = jQuery(this).find('+dd');
            
                     
            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('dd:eq(' + on + ')').slideDown(SLIDE_DOWN_SPEED);
         
        }
        
        
       
    });
   
};