function topSearchClick() {
	var form = document.forms[0];
	var count = 0;
	if (form.length) {
		for (var i=0; i<form.length; i++) {
			if (form[i].name.indexOf('chkTopSearch') > 0 && form[i].checked) {
				count++;
				if (count > 5) {
				    var errMessage = 'Selecting any more search terms will make your search too broad. You may only tick a maximum of 5 boxes.';
				    if (tooManySelected && tooManySelected[0])
				        errMessage = tooManySelected[0];
					alert(errMessage);
					return false;
				}
			}
		}
	}
	return true;
}