is my web page valid for xhtml 1.0?

Hi
Would you help me please?

MS IE6 don`t understand JavaScript expression:
for (var i=0; i < 9; i++) {......}
It is't understand < in this context.

May I use both :
for (var i=0; i<9; i++) {......}
and 
<p>
      <a href="http://validator.w3.org/check?uri=referer"><img
          src="http://www.w3.org/Icons/valid-xhtml10"
          alt="Valid XHTML 1.0!" height="31" width="88" /></a>
</p>
on my WEB page at the same time? Will be my document valid for XHTML 1.0 Transitional in fact???

Thank you very much.