replacing , with a .

XML Gurus,

I have a street field with comma's  in the field. I would like to replace
the 
commas with a . when i am extracting the data using XSL and writing the flat
file.

I am doing 

 <xsl:value-of
select="ShippingPointAddress/@ShippingPointStreet"></xsl:value-of> 

to write to the flat file.

Could some one let me know if there is a function to do this? 
To replace all the commas with . in the field  and how to use it.

thanks in advance 
Harsha 


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