nosbod,

Having looked at the url http://gvs.gs.washington.edu/GVS/ErrorPageSessionExpired.jsp they want you to access this form via a central menu on the homepage, where I guess they create a session. Have your mechanize object get the index page, click the link to the appropriate search (pga?) then populate the resultant form and submit.

Update: in my haste I forgot to mention that I would use WWW::Mechanize for this task. The documentation is great and has example code you could easily adapt for this task.

Hope this helps.

Martin