Download and save pdf files from webpage

I need to download a few thousand pdf files from a website, and am reluctant to do so manually. The site requires you to first log in using a user name and password, then go to a certain page, where you enter a date, click search, click download and then select where to save the file. The program should loop through dates from today and back in time and download files to a local folder as long as they are available. Delivery by May 10th 2011. (Sooner is preferable, of course) Prefered solution would be in .NET, however other languages/scripting types are also interesting. OS is Windows 7 ## Deliverables Attached is a dump of the Source code of the webpage supplying the pdf files.