thanks for prototype.jsを使おう:$()ファンクションの使い方: Recently Ajax
document.getElementById('xxx').value
$('xxx').value
var controls = array();
controls[0] = document.getElementById('xxx');
controls[1] = document.getElementById('yyy');
controls[2] = document.getElementById('zzz');
var controls = $('xxx', 'yyy', 'zzz');