Perhaps I am not picking up what you are saying properly.
What is to stop you using Win32::IE::Mechanize to do all of this?

You can use it to open an IE window:
#!/usr/bin/perl
use Win32::IE::Mechanize;
my $ie = Win32::IE::Mechanize->new( visible => 0 ); # you wanted it no
+t to be a visable window right?

[download]
which will be able deal with the JavaScript.
You could use the $ie->images method similarly to the way you were going to use WWW::Mechanize's $mech->images.
If I am not understanding some part of the problem let me know.

Hope this helps.

Martin

In reply to Re^4: save http image data by marto
in thread save http image data by kcella

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