/**
 * 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) {

	if(leftImage != null) {
	    var enabling = args[0];
	    var leftImage = args[1];
	    if(enabling) {
		    leftImage.src = ImagePathUI +"/pdetail_back.gif";	
	    } else {
		    leftImage.src = ImagePathUI + "/pdetail_back-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(rightImage != null) {
	    if(enabling) {
		    rightImage.src = ImagePathUI + "/pdetail_next.gif";
	    } else {
		    rightImage.src = ImagePathUI + "/pdetail_next-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:       5,
			animationSpeed:   0.15,
			scrollInc:         4,
			navMargin:         10,
			prevElement:     "prev-arrow",
			nextElement:     "next-arrow",
			size:              36,
			prevButtonStateHandler:   handlePrevButtonState,
			nextButtonStateHandler:   handleNextButtonState
		}
	);

};

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