Document.body.offsetHeight in IE 6 PC (JavaScript)

[lomokev]

why can't read the proerty document.body.offsetHeight when document.body.offsetWidth is being read or is just me.

could some one check this page and tell if document.body.offsetHeight returns as 0?

http://www.nypdltd.co.uk/test3.php

code is page:

<script language="JavaScript" type="text/JavaScript">
<!--
document.write("document.body.offsetHeight "+document.body.offsetHeight+"<br />\ndocument.body.offsetWidth "+document.body.offsetWidth);
//-->
</script>