First of all you should verify that hard drive from your crashed apple is still OK; Than you'll probably need something like SATA-USB adapter to connect screwd-up drive externally.
At this point you're facing manual transfer of album arts one by one which is huge PIA. For that I'd go to freelance.com and find/hire one who will put together for you a couple of VB-script(perhaps) lines to transfer them automatically.
At this point you're facing manual transfer of album arts one by one which is huge PIA. For that I'd go to freelance.com and find/hire one who will put together for you a couple of VB-script(perhaps) lines to transfer them automatically.