/**
 * 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:        1,
                        animationSpeed:    0.35,
                        scrollInc:         1,
                        navMargin:         0,
                        prevElement:     "prev-arrow",
                        nextElement:     "next-arrow",
                        size:              10,
                        prevButtonStateHandler:   handlePrevButtonState,
                        nextButtonStateHandler:   handleNextButtonState
                }
        );

};

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