// checks all checkboxes in list
function checkAll(formobj) {
	if (!formobj)	{
	}
	else {
		var list = formobj.elements;
		for(var i = 0; i < list.length; i++) {
			if (list[i].type == "checkbox") {
				list[i].checked = true;
			}
		}
	}
}

// unchecks all checkboxes in list
function uncheckAll(formobj) {
	if (!formobj) {
	}
	else {
		var list = formobj.elements;
		for(var i = 0; i < list.length; i++) {
			if (list[i].type == "checkbox") {
				list[i].checked = false;
			}
		}
	}
}

// toggles between all checkboxes checked and unchecked in list
function toggleCheck(formobj, field) {
	if (field.checked == true) {
		checkAll(formobj);
	}
	else {
		uncheckAll(formobj);
	}
}