dot to comma

hi, i am using wp-creator-calculator ver 2.5

and i want to ask you zetrider, how to change calculate from dot to commas,

for example:

now is calculation : 2.5 x 2.5
when i write 2,5 x 2,5 – there is an error

i want to write 2.5 x 2.5 and 2,5 x 2,5 both – dot and comma,

could you write me good code to change?,

br lkow77

http://wordpress.org/plugins/wp-creator-calculator/