using sed to add text to csv file

Hello to all. This is my first post to this mailing list. 

I have a CSV file with thousands of lines that is laid out like such.

First,Last,Address,City,St,Zip,email,phone,dob,optindate,ipaddress,url
Joey,Smith,12036 Address Lane,Beverly Hills,CA,90210,[email protected],2484865073,02/08/1962,4/2/2008 19:04:20,192.69.141.22,http://www.url.com/

I am trying to add text to the beginning of each table then change each line to the following


firstname=Joey&lastname=Smith&address=12036 Address Lane&

So basicallly I am trying to add the "headername=" text to the beginning of each row then replace the , with a & I know how to replace the comma I just can not figure out how to add the header text to the beginning of each line.


Thanks,

Gary


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