// validate
function validate(f) {
  	var info = "Crea nickname..."
  	if(f.nickname.value == "" || f.nickname.value == info) {
  		alert("Per creare un nickname inserisci prima un nome,\npoi premi Invio.");
  		f.nickname.focus();
   		return false;
  	}
  return true;
}

// bookmarks
function bookmarksite(title, url){
	if (document.all) window.external.AddFavorite(url, title);
	else if (window.sidebar) window.sidebar.addPanel(title, url, "")
}


// miscellaneous
$(document).ready(function(){

	// all_cat
	$('#download').click(function(){
	$(this).toggleClass('active');
	$('#all_cat').slideToggle('fast');
	});

	$('.close').click(function(){
	$('#all_cat').slideUp('fast');
	$('#download').removeClass('active');
	});


	// comments 
	$('#respond h3,#respond input[type="text"],#respond label').hide();
	$('#respond textarea').keyup(function(){
		$('input#author,input#email,label[for=author],label[for=email]').fadeIn('slow');
	});
	$('#respond textarea').val('Lascia un commento');
	$('#respond textarea').focus(function(){ 
		$(this).select();
	});


	// tabs
	var tabContainers = $('div.tabs > div');
	tabContainers.hide().filter(':first').show();
			
	$('div.tabs ul.tabNavigation a').click(function () {
		tabContainers.hide();
		tabContainers.filter(this.hash).show();
		$('div.tabs ul.tabNavigation li a').removeClass('selected');
		$(this).addClass('selected');
		return false;
	}).filter(':first').click();
	
});


// carousel
$.fn.infiniteCarousel = function () {

    function repeat(str, num) {
        return new Array( num + 1 ).join( str );
    }
  
    return this.each(function () {
        var $wrapper = $('> div', this).css('overflow', 'hidden'),
            $slider = $wrapper.find('> ul'),
            $items = $slider.find('> li'),
            $single = $items.filter(':first'),
            
            singleWidth = $single.outerWidth(), 
            visible = Math.ceil($wrapper.innerWidth() / singleWidth), // note: doesn't include padding or border
            currentPage = 1,
            pages = Math.ceil($items.length / visible);            

        if (($items.length % visible) != 0) {
            $slider.append(repeat('<li class="empty" />', visible - ($items.length % visible)));
            $items = $slider.find('> li');
        }

        $items.filter(':first').before($items.slice(- visible).clone().addClass('cloned'));
        $items.filter(':last').after($items.slice(0, visible).clone().addClass('cloned'));
        $items = $slider.find('> li'); // reselect
        
        $wrapper.scrollLeft(singleWidth * visible);
        
        function gotoPage(page) {
            var dir = page < currentPage ? -1 : 1,
                n = Math.abs(currentPage - page),
                left = singleWidth * dir * visible * n;
            
            $wrapper.filter(':not(:animated)').animate({
                scrollLeft : '+=' + left
            }, 150, function () {
                if (page == 0) {
                    $wrapper.scrollLeft(singleWidth * visible * pages);
                    page = pages;
                } else if (page > pages) {
                    $wrapper.scrollLeft(singleWidth * visible);
                    // reset back to start position
                    page = 1;
                } 

                currentPage = page;
            });                
            
            return false;
        }
        
        $wrapper.after('<a class="arrow back">&lt;</a><a class="arrow forward">&gt;</a>');
        
        $('a.back', this).click(function () {
            return gotoPage(currentPage - 1);                
        });
        
        $('a.forward', this).click(function () {
            return gotoPage(currentPage + 1);
        });
        
        $(this).bind('goto', function (event, page) {
            gotoPage(page);
        });
    });  
};