Just a note that maybe will save someone else the headache I had yesterday.
If you're using Dreamweaver – and create a new HTML page – it automatically sets your doctype like this:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
This caused a problem with a table-based design I had done. Images placed inside cells of a table had this odd space after all of them. Even though I had specified the table, and it's cells to the exact width and height of the image, as well, there was no space in the HTML itself. It only would happen on Netscape 6 – and as soon as I removed the doctype declaration – it went away.