$(document).ready(function(){
	$('.banner:not(:first)').css({visibility: "hidden"});
	$('.banner:first').addClass('showed');
})

function slideBanner(num) {
	var index = $('.big_photo > .banner').index($('.showed'));
	if(index == num) {
		$('.showed').removeClass('showed').css({visibility: "hidden"});
		$('.banner:first').addClass('showed').css({visibility: "visible"});
	} else {
		$('.showed').removeClass('showed').css({visibility: "hidden"})
		.next('div').addClass('showed').css({visibility: "visible"});
	}
}