//il codice è opera degli autori del sito http://www.prg.com

//permette di avere un'immagine diversa ad ogni accesso alla home page
var rand_slide = Math.floor(Math.random()*jQuery('#header .slide').length)+1;
jQuery('#header .slide:nth-child('+rand_slide+')').show().addClass('selected');
jQuery('#slide_nav li:nth-child('+rand_slide+')').addClass('selected');

//impostazione slideshow
var slideshow = setInterval('nextSlide()',5000);
function nextSlide() {
	if (jQuery('#header .slide.selected').next().length > 0) { 
		jQuery('#header .slide.selected').fadeOut('slow').removeClass('selected').next().fadeIn('slow').addClass('selected');
		jQuery('#slide_nav li.selected').removeClass('selected').next().addClass('selected');
	} else {
		jQuery('#header .slide.selected').fadeOut('slow').removeClass('selected');
		jQuery('#slide_nav li.selected').removeClass('selected');
		jQuery('#header .slide:first-child').fadeIn('slow').addClass('selected');
		jQuery('#slide_nav li:first-child').addClass('selected');
	}
}

//applicazione slideshow 
jQuery('#slide_nav li').mouseover(function(){
	clearInterval(slideshow);
	var slide_num = jQuery('#slide_nav li').index(jQuery(this))+1;
	jQuery(this).addClass('selected').siblings().removeClass('selected');
	jQuery('#header .slide:nth-child('+slide_num+')').fadeIn('slow').siblings().fadeOut('slow');
});