update statement

I got a series of string value in this format ie: 1,2,3, say pretend that these are telephone number, which is one feild in user table. I need to update this telephone number field, I got 3 user ID in series like this too, ie: 3,4,5 and normally it is like update set .... where userID IN (3,4,5) ( when there is one vaule to update, not series of string to update). How do I do that with this case then? cheers Jack jacky@activelifestyle.com "There is nothing more rewarding than reaching the goal you set for yourself"