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";
    }

};
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";
    }

};
var pageLoad = function()
{
    var carousel = new YAHOO.extension.Carousel("dhtml-carousel",
        {
            numVisible:        1,
            animationSpeed:   .15,
            scrollInc:         1,
            navMargin:         40,
            prevElementID:     "prev-arrow",
            nextElementID:     "next-arrow",
            size:              3,
            prevButtonStateHandler:   handlePrevButtonState,
            nextButtonStateHandler:   handleNextButtonState
        }
    );

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