Mine

function validateCopy() {	var t = false, fs; 	if (!(fs = document.forms['myForm'].elements['copy_list']).length)		t = fs.checked;	else {		for (var i = 0; i < fs.length; i++)			if (t = fs[i].checked) 				break;	}	if (!t) {		alert('You must check at least one sub-User Checkbox to copy settings to.');		return false;	}}