/**
 * 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 = "/img/carousel_pfeil_links.gif";    
    } else {
    	leftImage.src = "/img/carousel_pfeil_blank.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 = "/img/carousel_pfeil_rechts.gif";
    } else {
    	rightImage.src = "/img/carousel_pfeil_blank.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:    0.5,
            animationMethod:   YAHOO.util.Easing.easeOut,
            scrollInc:         1,
            navMargin:         0,
            prevElement:     "prev-arrow",
            nextElement:     "next-arrow",
            size:              carousel_size,
            prevButtonStateHandler:   handlePrevButtonState,
            nextButtonStateHandler:   handleNextButtonState
        }
    );
    
    //Hover over
    YAHOO.util.Event.addListener("prev-arrow", "mouseover", hoverOverArrowLeft);
    //Hover out
    YAHOO.util.Event.addListener("prev-arrow", "mouseout", hoverOutArrowLeft);
    
    //Hover over
    YAHOO.util.Event.addListener("next-arrow", "mouseover", hoverOverArrowRight);
    //Hover out
    YAHOO.util.Event.addListener("next-arrow", "mouseout", hoverOutArrowRight);

};


/*
 * Left Arrow Hover over function
 */
var hoverOverArrowLeft = function(e) {
	var elTarget = YAHOO.util.Event.getTarget(e);
	
	if (elTarget.src.indexOf('/img/carousel_pfeil_blank.gif') == -1) {
		elTarget.src = "/img/carousel_pfeil_links_mo.gif";
		YAHOO.util.Dom.setStyle(elTarget, 'cursor', '');

	} else {
		YAHOO.util.Dom.setStyle(elTarget, 'cursor', 'default');
	}
}

/*
* Left Arrow Hover out function
*/
var hoverOutArrowLeft = function(e) {
	var elTarget = YAHOO.util.Event.getTarget(e);
	
	if (elTarget.src.indexOf('/img/carousel_pfeil_blank.gif') == -1) {
		elTarget.src = "/img/carousel_pfeil_links.gif";
		YAHOO.util.Dom.setStyle(elTarget, 'cursor', '');

	} else {
		YAHOO.util.Dom.setStyle(elTarget, 'cursor', 'default');
	}
}


/*
 * Right Arrow hover over function
 */
var hoverOverArrowRight = function(e) {
	var elTarget = YAHOO.util.Event.getTarget(e);
	
	if (elTarget.src.indexOf('/img/carousel_pfeil_blank.gif') == -1) {
		elTarget.src = "/img/carousel_pfeil_rechts_mo.gif";
		YAHOO.util.Dom.setStyle(elTarget, 'cursor', '');

	} else {
		YAHOO.util.Dom.setStyle(elTarget, 'cursor', 'default');
	}
}
 
 /*
  * Right Arrow hover out function
  */
 var hoverOutArrowRight = function(e) {
 	var elTarget = YAHOO.util.Event.getTarget(e);
 	
 	if (elTarget.src.indexOf('/img/carousel_pfeil_blank.gif') == -1) {
		elTarget.src = "/img/carousel_pfeil_rechts.gif";
		YAHOO.util.Dom.setStyle(elTarget, 'cursor', '');

	} else {
		YAHOO.util.Dom.setStyle(elTarget, 'cursor', 'default');
	}
 }

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