argh!
Can\'t stand it that i can\'t figure it out myself....
i\'ve used this in the formatting of a number in my report:
\'€\' #,0.00;(\'€\' #,0.
For indian currency, in the field value use like =Format(Fields!ServiceTaxAmt.Value,"##,##,##,###.00") and change the language value to hi-in for report property.