function checkboxChecked(checkName)
{
	var checkboxArray = document.getElementsByName(checkName);
	var chackFound = false;
	
	for (var i = 0; i < len(checkboxArray) && checkFound == false; i++)
		if (checkboxArray[i].checked)
			checkFound = true;
			
	return checkFound;
}

function refreshButtonsFromCheckbox(buttonName, checkName)
{
	var buttonArray = document.getElementsByName(buttonName);
	var anyChecked = checkboxChecked(checkName);
	
	for (var i = 0; i < len(buttonArray); i++)
		buttonArray[i].disabled = !anyChecked;
}