/**
		 * Custom button state handler for enabling/disabling button state. 
		 * Called when the carousel has determined that the previous button
		 * state should be changed.
		 * Specified to the carousel as the configuration
		 * parameter: prevButtonStateHandler
		 **/
		var handlePrevButtonState = function(type, args) {

			var enabling = args[0];
			var leftImage = args[1];
			if(enabling) {
				leftImage.src = "images/left-enabled.gif";    
			} else {
				leftImage.src = "images/left-disabled.gif";    
			}
			
		};

		/**
		 * Custom button state handler for enabling/disabling button state. 
		 * Called when the carousel has determined that the next button
		 * state should be changed.
		 * Specified to the carousel as the configuration
		 * parameter: nextButtonStateHandler
		 **/
		var handleNextButtonState = function(type, args) {

			var enabling = args[0];
			var rightImage = args[1];
			
			if(enabling) {
				rightImage.src = "images/right-enabled.gif";
			} else {
				rightImage.src = "images/right-disabled.gif";
			}
			
		};


		/**
		 * You must create the carousel after the page is loaded since it is
		 * dependent on an HTML element (in this case 'mycarousel'.) See the
		 * HTML code below.
		 **/
		var carousel; // for ease of debugging; globals generally not a good idea
		var pageLoad = function() 
		{
			carousel = new YAHOO.extension.Carousel("mycarousel", 
				{
					numVisible:        3,
					animationSpeed:    0.15,
					scrollInc:         3,
					navMargin:         20,
					prevElement:     "prev-arrow",
					nextElement:     "next-arrow",
					size:              19,
					prevButtonStateHandler:   handlePrevButtonState,
					nextButtonStateHandler:   handleNextButtonState
				}
			);

		};

		YAHOO.util.Event.addListener(window, 'load', pageLoad);