I tried out that first one, and that definitely works for the image swapping on that page. Here's what mine looks like:

<img src="A.gif" name="image1" OnMouseOver="document.image1.src='B.gif';document.image2.src='D.gif'" onmouseout="document.image1.src='A.gif';document.image2.src='B.gif'">
<img src="C.gif" name="image2">

Say that there are 5 links with images like this. Now say that this link leads to something like a links page. When that links page is loaded, how do I make it so that images B and D are loaded by default. I can't just change that link to simply show those images with plain HTML, because as I said, this menu will be in an include.