javascript email link with image

Hi experts,

I have this code that works fine

<p>
                <script language=javascript>
                  <!--
                  var contact = "Email us!"
                  var email = "mailbox"
                  var emailHost = "fobgfc.org"
                  document.write("<a href=" + "mail" + "to:" + email + "@" + emailHost+ ">" + contact + "</a>")
                  //-->
                </script>
</p>

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but I wanted to spice it up with an image, rather than just "Email us!" text...how would I do that please?

Cheers,

  Col