Here's my fix for the "(Click here to view the original thread with full colors/images)" bad url issue. Notice I also shortened the _REQUEST var to "t" instead of "threadid". That keeps it consistant with the forumdisplay.php output.
PHP Code:
<a href=\"$archive_options[forumurl]/showthread.php?t=$threadinfo[threadid]\">(Click here to view the original thread with full colors/images)</a>