delay = 10000;
function changeQuote() {
    q = $('custquote')
    notq=q.firstDescendant().href.split('#')[1]
    q.fade({afterFinish: function () {
    upd = new Ajax.Updater({success:q},'quotes.html?not=' + notq,{onSuccess: function() {
            setTimeout(changeQuote,delay)
        }, onComplete: function() {
            q.appear()
        }})
    }})
}

setTimeout(changeQuote,delay)