Così con i css:
codice:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Documento senza titolo</title>
<style type="text/css">
<!--
.giallo {
	background-color: #FFFF00;
}
.grigio {
	background-color: #CCCCCC;
}
-->
</style></head>

<body>

<table width="70%" border="2" cellspacing="0" cellpadding="0">
  <tr class="giallo">
    <td></td>
    <td></td>
    <td></td>
  </tr>
  <tr class="grigio">
    <td></td>
    <td></td>
    <td></td>
  </tr>
  <tr class="giallo">
    <td></td>
    <td></td>
    <td></td>
  </tr>
  <tr class="grigio">
    <td></td>
    <td></td>
    <td></td>
  </tr>
  <tr class="giallo">
    <td></td>
    <td></td>
    <td></td>
  </tr>
  <tr class="grigio">
    <td></td>
    <td></td>
    <td></td>
  </tr>
  <tr class="giallo">
    <td></td>
    <td></td>
    <td></td>
  </tr>
</table>



</body>
</html>