(function($){  
	var scrollAmount = 500;

	$.fn.scrollLeft = function(options) {
		$(":first",this).animate({marginLeft: (parseInt($(":first",this).css("margin-left")) + scrollAmount) + "px"});
	};
	
	$.fn.scrollRight = function(options) {
		$(":first",this).animate({marginLeft: (parseInt($(":first",this).css("margin-left")) - scrollAmount) + "px"});
	};
})(jQuery);