Need Function Module

Hi

Could anyone tell me how to insert a decimal point in a number and how to remove " ," from the number ?

Is there any function module regarding this conversion ?

for example :

This is the number : 20,880.000

I need to display the above number like : 208800.00 by changing code.

I need some function module regarding this change .

I have searched in Google but I didn't find any function modu.

Could anyone say me the function module for this problem ?