UPDATE my_table
   SET imageurl = CONCAT(
         LEFT(imageurl, LENGTH(imageurl) - INDEX( imageurl, '.jpg') )
        ,'.gif'\
       )

[download]

You'll have to play with it to make sure there isn't an off-by-one error.

My wife's blog

In reply to Re: Performing substitutions in MySQL by dragonchild
in thread Performing substitutions in MySQL by webchalkboard

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