// JavaScript Document

/**
 * Image src URLs
 **/
var imageList = [
                 "bottom-marquee/brass1.gif",
                 "bottom-marquee/ironmongery1.gif",
                 "bottom-marquee/blackantique1.gif",
                 "bottom-marquee/aluminium1.gif",
                 "bottom-marquee/miscellaneous1.gif",
                  "bottom-marquee/brass2.gif",
                 "bottom-marquee/ironmongery2.gif",
                 "bottom-marquee/blackantique2.gif",
                 "bottom-marquee/aluminium2.gif",
                 "bottom-marquee/miscellaneous2.gif"
                              
                 ];



var imagelink=[
					"brass.aspx",
 				"ironmongery.aspx",
				"black_antique.aspx",
				"aluminium.aspx",
				"miscellaneous.aspx",
				"brass.aspx",
 				"ironmongery.aspx",
				"black_antique.aspx",
				"aluminium.aspx",
				"miscellaneous.aspx"
			   ]



var imgname=[
			 "Brass Hardware",
			 "Ironmongery",
			 "Black Antique",
			 "Aluminium",
			 "Miscellaneous ",
			 "Brass Hardware",
			 "Ironmongery",
			 "Black Antique",
			 "Aluminium",
			 "Miscellaneous"
			 		
			 ];

/**
 * Since carousel.addItem uses an HTML string to create the interface
 * for each carousel item, this method formats the HTML for an LI.
 **/
var fmtItem = function(imgUrl, url, title) {

      var innerHTML = 
          '<a href="' + 
          url + 
          '"><img src="' + 
          imgUrl +
        '" width="' +
        100 +
        '" height="' +
        90+
        '"/>' + 
          title + 
          '<\/a>';
  
    return innerHTML;
    
};

/**
 * Custom inital load handler. Called when the carousel loads the initial
 * set of data items. Specified to the carousel as the configuration
 * parameter: loadInitHandler
 **/
var loadInitialItems = function(type, args) {
    var start = args[0];
    var last = args[1]; 

    load(this, start, last);    
};

/**
 * Custom load next handler. Called when the carousel loads the next
 * set of data items. Specified to the carousel as the configuration
 * parameter: loadNextHandler
 **/
var loadNextItems = function(type, args) {    

    var start = args[0];
    var last = args[1]; 
    var alreadyCached = args[2];
    
    if(!alreadyCached) {
        load(this, start, last);
    }
};

/**
 * Custom load previous handler. Called when the carousel loads the previous
 * set of data items. Specified to the carousel as the configuration
 * parameter: loadPrevHandler
 **/
var loadPrevItems = function(type, args) {
    var start = args[0];
    var last = args[1]; 
    var alreadyCached = args[2];
    
    if(!alreadyCached) {
        load(this, start, last);
    }
};

var load = function(carousel, start, last) {

    for(var i=start; i<=last; i++) {
        carousel.addItem(i, fmtItem(imageList[i-1], imagelink[i-1], imgname[i-1]));
    }
};



/**
 * 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 = "bottom-marquee/left-enabled.png";        
    } else {
        leftImage.src = "bottom-marquee/left-disabled.png";    
    }
    
};

/**
 * 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 = "bottom-marquee/right-enabled.png";    
    } else {
        rightImage.src = "bottom-marquee/right-disabled.png";
    }
    
};

/**
 * You must create the carousel after the page is loaded since it is
 * dependent on an HTML element (in this case 'dhtml-carousel'.) 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("dhtml-carousel", 
        {
            numVisible:        5,
            animationSpeed:    0.4,
            animationMethod:   YAHOO.util.Easing.easeBoth,
            scrollInc:         3,
            navMargin:         40,
            size:              10,
            loadInitHandler:   loadInitialItems,
            prevElement:     "prev-arrow",
            nextElement:     "next-arrow",
            loadNextHandler:   loadNextItems,
            loadPrevHandler:   loadPrevItems,
            prevButtonStateHandler:   handlePrevButtonState,
            nextButtonStateHandler:   handleNextButtonState
        }
    );
};

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