No idea personally. I would say that you might want to check older versions of IE for sure. It's notorious for not being standards compliant, and I had similar issues a couple months ago. Also, I noticed you're using XHTML. I talked to someone a few weeks ago who does web design professionally, and it turns out that a lot of errors W3 spits out are bogus in XHTML. Here's what I've got from him in an email:
Quote:
The majority of the errors and warnings being displayed there are bogus. The validation engine is trying to parse your script section as html. Notice in the first script section of your page, there are html comment tags ( <!-- and -->) surrounding the whole script section, just inside the script tags. This will cause the html parser to ignore everything between those tags. Your second script section does not have the comments, and so the W3 parser is incorrectly trying to evaluate the validity of that section as if it were html, which it is not. Put the comment tags around that script block as it was done in the first one, and you will eliminate the bulk of the errors.
Then you can start working away at the remaining validation errors.
A few real errors I noticed are:
</img> - image tags do not have closing tags. remove the </img> tags.
id="about us" - id and name attributes cannot have spaces in them.
id=content - attributes must be enclosed in quotation marks.
<img ...> - image tags must have an alt attribute. The alt attribute specifies the text that will be displayed in place of that image on a text-only browser.
<tr></tr> - this table row has no cells. You need to put the same number of cells in every row of a table. Remember a <td colspan="3"></td> is 3 cells.
bordercolor="#..." - although this was valid in previous html specs, some attributes have been removed from the latest html specification. Others include "border" on img tags, <font> tags, and others. In these cases you should instead use CSS styles to apply those attributes. This can be done by using a style attribute like so: style="border-color: #...; border: none; font-face: Arial" and so forth.
href="http://www.nasa.gov"target="_blank" - you need to put a space between attributes.
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Also, use conditional statements if you're still having trouble. Unfortunately, I'm not very good at explaining them, so perhaps someone else could do the honors, or maybe a little research is all you need.