function $(id) {
return document.getElementById(id);
}

function rollover(element, newsrc) {
return element.src = './images/' + newsrc;
}

function show(id, id_close) {
if ($(id).style.display != 'block') {
$(id).style.display = 'block';
$(id_close).style.display = 'none';
$(id_close + 'i').src = './images/arrow_close.jpg';
$(id + 'i').src = './images/arrow_open.jpg';
} else {
$(id).style.display = 'none';
$(id + 'i').src = './images/arrow_close.jpg';
}
}