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1 - first:
--- markup embedded in a comment can confuse some browsers.
2 - second:
HTML: <area shape="rect" coords="-1,455,140,476" href="guests.html" alt="sign our guestbook we would love to hear from you!">
PROBLEM: attribute `ALT' for <area> is extended markup (use "-x <extension>" to allow this).
3 - third:
HTML: <table width="15%" border="1" height="111" bordercolor="#006699" cellspacing="0" bgcolor="#FFFFCC">
PROBLEM: attribute `BORDERCOLOR' for <table> is extended markup (use "-x <extension>" to allow this).
4 - forth:
HTML: <form method="get" action="http://search.atomz.com/search/"></form>
PROBLEM: empty container element <FORM>.
and keep going with...
PROBLEM: attribute `TABINDEX' for <input> is extended markup (use "-x <extension>" to allow this).
PROBLEM: attribute `STYLE' for <a> is extended markup (use "-x <extension>" to allow this).
that's all finally...
thanks to everybody...
Here's another thread that reviews many of the available HTML validators which you might find handy. Link to validator's thread [webmasterworld.com]
Also, since you are using TABINDEX, you should be aware of some differences in the way browsers execute it. The W3C has a great TABINDEX test page [w3.org] that also documents the differences between major browsers and platforms.
It looks like the first message was telling you that you have an illegal comment containing "--" sequences. I'm not absolutely sure that's what it was trying to say, though.
I would suggest checking into number one (markup embedded in a comment). That sounds odd to me. But definitely don't worry about all those "extended markup" reports.