function checkAll() {
 // if "All Pallet Labeling Systems" is checked, check all Pallet Labelers
 if(document.forms.EmailData.AllPalletLabelingSystems.checked)
 {
  document.forms.EmailData.SA1000.checked = true;
  document.forms.EmailData.SA1010.checked = true;
  document.forms.EmailData.SA2200.checked = true;
  document.forms.EmailData.SA2210.checked = true;
 }
 // if "All Unit Load Stackers" is checked, check all Stackers
 if(document.forms.EmailData.AllUnitLoadStackers.checked)
 {
  document.forms.EmailData.PS520.checked = true;
  document.forms.EmailData.PS600.checked = true;
 }
 // if "All RFID Equipment" is checked, check all RFID Equipment
 if(document.forms.EmailData.AllRFIDEquipment.checked)
 {
  document.forms.EmailData.RFIDPortal.checked = true;
  document.forms.EmailData.RFIDCaseReader.checked = true;
  document.forms.EmailData.RFIDCaseLabeler.checked = true;
 }
}