I have a quick question

Everything you do to a site's bare code, is going to change how
google looks at your site. I don't see how you can the site the same,
code-wise, and still change the way the site looks. If the code
stays the same, then it stays the same.

Here's just a small example. You have a color code for the
background. I'm old school, so I'd code bgcolor="#FFFFFF"
in the body tag. I now want a background image, so instead I
change it to, background="url of background image"
Now the code is changed. The image url could be a signal to
google.

The way I have done it, is to swap out images using the exact
same url.

If you move the menu bar, that would also be perhaps unwarranted
signals. An example is this. You have a left side bar menu which
probably occurs in the code high up, as left is usually coded first.
Google sees the menu links/text first before content. Changing that
menu to the right, now puts content up higher in the code. The
text higher up is now changed.

Higher up in the code seems to be more important that lower.
Google may actually disregard stuff at the very bottom for
rankings, relevance, etc.

2 small examples.

Paul