For this exercise also, if you don't have a frames capable browser, then you may want to skip it, as you won't be able to see what's happening.
OK, this is where it is going to get a little more complicated. What you're going to need to do is start a new file, and call it something different to the other one. Then you'll need to copy and paste all the <head> information in from the file that we've been creating all along.
Now you'll need to make sure that all of your links to external pages are targeted to take up the whole browser window, instead of getting loaded into your frames page. You needn't worry about the ones from the imagemap, as they're part of your page.