Currency field conversion

Hi folks,

we need to display a amount field in the smartform. it should be displayed along with the dollar symbol. For example, as '$100'. So we converted the currency field into character and concatenated. Its working fine but...it is unable to produce comma, in between the amount value...But we need to generate the comma also as '$1,000'.....So, pleas suggest me how can i do this..Thanks in advance...

Shyam.