var validationMessages = {required : {yes   : 'This field must be entered!',
                                      maybe : 'Are you sure that you want to leave this field empty?'
                                      },
                          alphanum : 'This field may contain alphanumeric characters only (letters A-Z, numerals 0-9 and underscore "_")',
                          numeric  : 'This field must contain a numeric value.',
                          jmbg     : 'JMBG invalid.',
                          date     : 'Invalid date.',
                          time     : 'Invalid time.'
                          };