Requiring Minimum Values

          // require notes on all airfare exceeding $1,000 dollars 
function airfareCost() {
   var cost = NSOA.form.getValue('cost');
   var notes  = NSOA.form.getValue('notes');
   var item = NSOA.form.getValue('item_id');
   
   if ( cost > 1000 && notes.length < 1 && item == '4' ) {

      NSOA.form.error('notes', 'Notes are required for Airfare exceeding $1,000.');
   }
}