function c_ct13_hideAll()
{
  if (document.forms[0].c_ct13 != null)
  {
    if (document.forms[0].c_ct13.checked == false) {changeObjectVisibility("c_ct13_QS","hidden","none");}
  }

//  if (document.crForm.c_ct13.checked == false) {changeObjectVisibility("c_ct13_QS","hidden","none");}
}