Lo hice así finalmente:
Código HTML:
<BODY onLoad="setTimeout(aaa(7), 1000)">
<SCRIPT LANGUAGE="Javascript">
function aaa(cadena)
{
cadena1 = parseInt(cadena);
cadena1 -= 1;
if (cadena1 > 6)
cadena1 = '0' - cadena1;
bx.innerHTML = cadena1;
if (cadena == 1)
location.href = '<? echo "$web"; ?>';
if (cadena == 1)
document.Form.txt_web.value = web;
<!--
setTimeout("aaa(cadena1)",1000);
-->
}
</SCRIPT>
<FORM NAME="Form">
<div id="bx"></div>
</FORM>
</BODY>
</HTML> vuala...