rnd.today=new Date();
rnd.seed=rnd.today.getTime();

function rnd() {
        rnd.seed = (rnd.seed*9301+49297) % 233280;
        return rnd.seed/(233280.0);
};

function rand(number) {
        return Math.ceil(rnd()*number) + 1;
};


document.getElementById('rightuppergraphic').src = 'http://www.naturenet.com/images/headerpic' + rand(6) + '.gif';