$(function() {
	window.setInterval("change_foto()", 30000);
});

function change_foto()
{
	src = window.location.href + 'styles/default/images/foto';
	r = 0;
	while (!(r >= 1 && r <= 7)) {
		r = Math.round(Math.random() * 10);
	}
	src = src + r + '.jpg';
	$("#foto").attr("src", src).slow();
}