Edited by SomeNewKid. Please post code between <code> and </code> tags.
Well, I was under the mistaken impresion that I could not use scripts either, but I was wrong.
Just place this script inside the contentholder, "var limit min:sec"
<script>
var limit="15:0"
if (document.images)
{
var parselimit=limit.split(":")
parselimit=parselimit[0]*60+parselimit[1]*1
}
function beginrefresh()
{
if (!document.images)
return
if (parselimit==1)
window.location.reload()
else
{
parselimit-=1
curmin=Math.floor(parselimit/60)
cursec=parselimit%60
setTimeout("beginrefresh()",1000)
}
}
window.onload=beginrefresh
</script>