Logo html does not validate

As an example...this is from the homepage of comodo:

Code:

<html>
<head>
<style type="text/css">
.small {
font-family: Arial, Helvetica, sans-serif;
font-size: 8px;
color: #000000;
}
.header {
font-family: Verdana, Arial, Helvetica, sans-serif;
font-size: 11px;
font-weight: 900;
color: #000000;
border: none;
}
.medium {
font-family: Arial, Helvetica, sans-serif;
font-size: 11px;
color: #000000;
}
.VE {
font-family: Arial, Helvetica, sans-serif;
font-size: 12px;
font-weight: 900;
color: #FF0000;
padding-left: 8px;
}
.ve-link:active, .ve-link:visited, .ve-link:link{
color: #FF0000;
text-decoration: underline;
}
.ve-link:hover{
color: #FF3300;
text-decoration: underline;
}
</style>
</head>

<body leftmargin="0" topmargin="0" marginwidth="0" marginheight="0">
<table width="244" height="194" border="0" cellpadding="0" cellspacing="0" background="/trustlogo/images/popup/cornertrust-bg.jpg">
<tr>
<td align="left" valign="top"><table width="100%" height="188"
border="0" cellpadding="0" cellspacing="0">
<tr>
<td height="45" align="left" valign="top"> </td>
</tr>

<tr>
<td height="127" align="left" valign="top"><div align="left">
<table width="100%" height="127" border="0" cellpadding="0" cellspacing="0">
<tr>
<td height="33" align="left" valign="top"><table width="100%" height="33" border="0" cellpadding="0" cellspacing="0">
<tr>
<td width="82%" align="left" valign="middle" class="header">
<div style="padding:0px 0px 0px 8px;text-align: left;vertical-align: middle;">
<script>
var coname="Comodo CA Limited";document.write(coname.replace(/ /g,""));
</script>

</div>
</td>
<td width="18%" align="left" valign="middle"><img alt="" src="/ttb_searcher/binary/logo.asp?v_querytype=flag&v_search=GBR" vspace="3px" width="31px" height="17px"></td>
</tr>
</table></td>
</tr>
<tr>
<td height="69" align="center" valign="middle" class="medium">
3rd Floor, Building 26
Office Village, Exchange Quay<br>

Trafford road
Salford, Greater Manchester, M5 3EQ, United Kingdom<br>
<span class="header">http://www.comodo.com/</span><br>
<span class="header">28-FEB 2007 13:47:22 GMT</span></td>
</tr>
<tr>
<td height="20" align="center" valign="middle" class="medium"></td>
</tr>

</table>
</div></td>
</tr>
<tr>
<td height="13" align="left" valign="top" class="small">   <b>© Copyright. Data provided by IdAuthority ™</b></td>
</tr>
</table></td>
</tr>

</table>
</body>
</html>

This is what the Html validator 0.7.9.5 plugin for Firefox says about it:

Quote

line 1 column 1 - Warning: missing <!DOCTYPE> declaration
line 60 column 110 - Warning: unescaped & or unknown entity "&v_search"
line 2 column 1 - Warning: inserting missing 'title' element
line 39 column 1 - Warning: <body> proprietary attribute "leftmargin"
line 39 column 1 - Warning: <body> proprietary attribute "topmargin"
line 39 column 1 - Warning: <body> proprietary attribute "marginwidth"
line 39 column 1 - Warning: <body> proprietary attribute "marginheight"
line 40 column 1 - Warning: <table> proprietary attribute "height"
line 40 column 1 - Warning: <table> proprietary attribute "background"
line 42 column 32 - Warning: <table> proprietary attribute "height"
line 49 column 2 - Warning: <table> proprietary attribute "height"
line 51 column 44 - Warning: <table> proprietary attribute "height"
line 55 column 2 - Warning: <script> inserting "type" attribute
line 60 column 47 - Warning: <img> attribute "vspace" has invalid value "3px"
line 60 column 47 - Warning: <img> attribute "width" has invalid value "31px"
line 60 column 47 - Warning: <img> attribute "height" has invalid value "17px"

0 errors / 16 warnings

If you cut and paste the code into the W3C validator it gets pretty much the same