function changeDynaList( list, source, key, orig_key, orig_val ) {
	// empty the list
	for (i in list.options.length) {
		list.options[i] = null;
	}
	i = 0;
	for (x in source) {
		if (source[x][0] == key) {
			opt = new Option();
			opt.value = source[x][1];
			opt.text = source[x][2];

			if ((orig_key == key && orig_val == opt.value) || i == 0) {
				opt.selected = true;
			}
			list.options[i++] = opt;
		}
	}
	list.length = i;
}