Failed when retrieving *some* relative references

When generating a sitemap for bigtubresort. ca, the tool fails on some relative references but not others. For instance on
bigtubresort. ca/motel.php
the tool will correctly index

bigtubresort. ca/images/one-bed-700×525.jpg
bigtubresort. ca/images/one-bed-700x525t.jpg

but not

bigtubresort. ca/images/lighthouse.jpg
bigtubresort. ca/images/big-tub-harbour-resort-tobermory-ontario.jpg
bigtubresort. ca/images/two-bed-700×525.jpg
bigtubresort. ca/images/two-bed-700x525t.jpg

I’m using the latest Sun Java as per java. com/en/download/help/testvm.xml on Gentoo Linux with Firefox 2.0.0.16.

Thanks for any help you can give me.