var gallery = {
    
    count : null,    
    index : null,
    
    init : function() {
        
        gallery.count = $("#itemCount").text();
        gallery.index = 0;
        
        $(".galleryForward").click(function(e){ 
            if(gallery.index == gallery.count - 1) {
                gallery.index = 0; 
            }
            else {
                gallery.index = gallery.index + 1;
            }            
            gallery.swap();
            e.preventDefault();
        });
        
        $(".galleryBack").click(function(e){ 
            if(gallery.index == 0) {
                gallery.index = gallery.count - 1; 
            }
            else {
                gallery.index = gallery.index - 1;
            }
            gallery.swap();
            e.preventDefault();
        });
    
    },
    
    swap : function() {
        $("#imageHolder img").attr("src",imgSrcs[gallery.index]);
        $("#imageHolder img").attr("alt",imgAlts[gallery.index]);
        $("#caption").text(imgCaptions[gallery.index]);
        $("#itemIndex").text(gallery.index + 1);
    }
      
}

$(document).ready(function(){
    gallery.init();
});