var handlePrevButtonState = function(type, args) {
    var enabling = args[0];
    var leftImage = args[1];
    if(enabling) {
        leftImage.src = "images/up-enabled.gif";    
    } else {
        leftImage.src = "images/up-disabled.gif";    
    }
};
var handleNextButtonState = function(type, args) {
    var enabling = args[0];
    var rightImage = args[1];
    if(enabling) {
        rightImage.src = "images/down-enabled.gif";
    } else {
        rightImage.src = "images/down-disabled.gif";
    }
};
var carousel;
var pageLoad = function() 
{
    carousel = new YAHOO.extension.Carousel("firma", 
        {
            numVisible:        2,
            animationSpeed:    0.9,
            scrollInc:         2,
            navMargin:         7,
            animationMethod:    YAHOO.util.Easing.easeBoth,
            prevElement:     "prev-arrow",
            nextElement:     "next-arrow",
            size:              ELEMENTOW,
            disableSelection: false,
            prevButtonStateHandler:   handlePrevButtonState,
            nextButtonStateHandler:   handleNextButtonState,
            orientation: "vertical",
            autoPlay: 4000,
            wrap:true


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