var handlePrevButtonState = function(type, args) {
	var enabling = args[0];
	var leftImage = args[1];
	if(enabling) {
		leftImage.src = "images/a.up.gif";	
	} else {
		leftImage.src = "images/a.up.gif";	
	}
};

var handleNextButtonState = function(type, args) {
	var enabling = args[0];
	var rightImage = args[1];
	if(enabling) {
		rightImage.src = "images/a.down.gif";
	} else {
		rightImage.src = "images/a.down.gif";
	}
};

var carousel; // for ease of debugging; globals generally not a good idea
var pageLoad = function() 
{
	carousel = new YAHOO.extension.Carousel("mycarousel", 
		{
			loadOnStart: 	 false,
			numVisible:      2,
			animationSpeed:  0.7,
			scrollInc:       2,
			orientation:     "vertical",
			navMargin:       20,
			prevElement:     "prev-arrow",
			nextElement:     "next-arrow",
			autoPlay: 		 5000,
			size:            18,
			wrap:            true,
			prevButtonStateHandler:   handlePrevButtonState,
			nextButtonStateHandler:   handleNextButtonState
		}
	);
};
YAHOO.util.Event.addListener(window, 'load', pageLoad);