Automatic File Download

I need to download files from the website http://www.nfohump.com. The URL to the file download is [login to view URL] The ID changes depending on which file you want to download. That link makes a pop-up with the file download appear (the direct link doesn't show anywhere). I need a script that will fetch the IDs from a MySQL table and then download the corresponding file. It needs to have a time delay so that the download doesn't look like a denial of service attack to the server.