Graphic's Source Code

I do a lot of transferring of sites to WordPress. The problem is when I transfer the sites the internal links and graphic src codes still point back to the previous site. I manually go in there and redirect them. Annoying, but not a huge deal.

I just had a client though who had a massive blog with over 900 graphics all needing to be redirected. I realize this is static code, but does anyone know of a plugin, some type of automation, or something within the transfer process I could do to eleviate this problem.

Thanks so much in advance for your help