var banner_prec;
var tot_banner = 0;
var num_banner = 1;

$(document).ready(function() {
	// Inizializzazione slide banner
	$('#banner div').css('opacity',"0");
	$('#banner div:first').css('margin-left',"0px");
	$('#banner div:first').css('opacity',"1");
	banner_prec = $('#banner div:first');
	tot_banner = $("#banner div").size();
	setInterval("bannerSlide()", 4000);
});

function bannerSlide() {
	if (num_banner == tot_banner) {
			banner_prec.animate({'marginLeft' : "+=50px",'opacity' : "0"});
			banner_prec = $('#banner div:first');
			banner_prec.animate({'marginLeft' : "-=50px",'opacity' : "1"});
			num_banner = 1;
	} else {
			banner_prec.animate({'marginLeft' : "+=50px",'opacity' : "0"});
			banner_prec = banner_prec.next();
			banner_prec.animate({'marginLeft' : "-=50px",'opacity' : "1"});
			num_banner++;
		}
}