I have a copy of 4.6, so I'm assuming they're similar. The Bookmarks file doesn't allow highlighting of the URLs for copy & paste functions, but taking a snapshot of them works. If you haven't done this before (it's really cool), you can take a full screen snapshot by pressing "shift - command - 3" or you can take a snapshot of a selected only area by pressing "shift - command - 4" and using the crosshairs curser that appears to outline the area you want to capture. Bring the curser to the upper left hand corner of the desired field and hold down the mouse button as you drag the curser to the bottom right corner of the desired field. When you release the button, you wil hear the "shutter click" sound that tells you a picture has been taken. You'll find the picture files in your hard drive window. Just open the file and print it your "picture". It's great for capturing segments of web pages and graphics.
If the newer computer has a floppy drive, you could just make a copy of the bookmarks file (in the System Folder / Preferences / Netscape Users / your profile). If no floppy, could you e-mail a copy to the new computer? All you would then have to do is replace the bookmarks file in the new computer with your copy and your done.