function setCheckboxes(the_form, do_check)
{
	var elts = document.forms[the_form].elements['a[]'];
	var elts_cnt = (typeof(elts.length) != 'undefined')
		? elts.length : 0;

	if (elts_cnt) {
		for (var i = 0; i < elts_cnt; i++) {
			elts[i].checked = do_check;
		}
	} else {
		elts.checked = do_check;
	}

	return true;
}