function showRandomPromo() {
    var promos=document.getElementById('promos');
    var p = promos.getElementsByTagName('span');
    curr = Math.ceil(p.length*Math.random());
    p[curr-1].style.display='block';
}
function activate_expandables() {
    var anchs = document.getElementsByTagName('a');
    for(i=0;i<anchs.length;i++) {
        if(anchs[i].className=='expandable') {
            anchs[i].onclick=function anonymous(){var d=this; while(d.tagName.toLowerCase()!='div') d=d.parentNode;
            var d=d.getElementsByTagName('div')[0]; if(d.className=='nodisplay') d.className='shown'; else d.className='nodisplay'; return false;}
            var d=anchs[i]; while(d.tagName.toLowerCase()!='div') d=d.parentNode;
            var d=d.getElementsByTagName('div')[0]; d.className='nodisplay';
        }
    }
}