checked = false;
function checkedAll () {
	if (checked == false){checked = true}else{checked = false}
for (var i = 0; i < document.getElementById('myform').elements.length; i++) {
  document.getElementById('myform').elements[i].checked = checked;
}
  }

function check( me, id )
{
	checkbox = document.getElementById( id );
	checkbox.checked = ( me.value != 'NULL' ) ? true : false;
	return;
}