The bottom half builds
windowopen("[link|http://_135_blanks_@"|http://_135_blanks_@"] + ???_1,"","width=800, height=600, menubar=???_2, resizable=0, scrollbars=1, status=0, titlebar=0, toolbar=0, left=100, top=100" + ???_3);
which matches the discussion on SpamCop.
The real URL is decoded by the top half, but the seed value is missing.
Wondering if deobfuscating this was a violation of the DMCA? ;-)