Validation code on the site.

Hello!
When checking the validity of the code on our site ( http://secret-idea.com/ ) there are 7 errors. Please tell us what kind of errors and how to correct them:

Line 21, Column 71: required attribute "alt" not specified:
… width="15" height="15" border="0" />

Perhaps the symbol ">" indicates a missing indication of "alt", but then that means the error:

Line 239, Column 31: document type does not allow element "script" here:
<script type="text/javascript">

in which the symbol ">" is also highlighted in red?

-- 
John Pash
Web Programmer
Web: secret-idea.com <http://secret-idea.com/>

mailto:support@secret-idea.com