Defining positive, negative and zero formats
          To define positive, negative and zero formats place a semicolon between the formats.
         
         Any character can be used to define the sign. For example:
 #,###.##;#,###.##-; 0 will output 1,234.56 or 1,234.56- or 0
Any character can be used to define the sign.
 #,###.## DR; #,###.## CR; 0 DR will output 1,234.56 DR or 1,234.56 CR or 0 DR 
and #,###.##;(#,###.##), 0 will output 1,234.56 or (1,234.56) or 0