jQuery.fn.extend({
	    ps_header_captions: function ( options ) {

	        var defaults = {
		        container : '.ps-header-captions',
		        caption_tag : 'span',
		        start_caption : 1,
		        delay : 5000,
		        speed : 'slow'
	        };

	        var settings = $.extend( {}, defaults, options );

	        var _arr_captions = [];
	        var _prev_index = settings.start_caption - 1;
	        var _this = $(settings.container);
	        var _captions = _this.find(settings.caption_tag);
	        var _num_captions = _captions.length;

	        // loop through captions and hide
	        // --
			_captions.each(function() {
				_arr_captions.push($(this));
				$(this).hide();
			});
			_this.css('display', 'inline-block');
			_arr_captions[0].fadeIn(settings.speed);

			// set timeout
			// --
			setInterval(function(){
				_arr_captions[_prev_index].hide();
			   	_arr_captions[settings.start_caption].fadeIn();
			   	_prev_index = settings.start_caption;
			   	settings.start_caption = (settings.start_caption + 1) % _num_captions;
			}, settings.delay);

			return;
	    }

	});

	$('.ps-header-captions').ps_header_captions({
		delay: 5000,
		caption_tag: 'span',
		speed: 'slow'
	});