Well your function takes a parameter, varURL and you're not supplying it, that's why it's undefined.

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Joe

OK, how would I define varURL?

(as you might have guessed, I don't know my javascript too well!)

Cheers

Adam

<script language="javascript" type="text/javascript">
function ConfirmBasePrice(varURL)
{
    if (confirm("Make sure you haven't changed\nthe base level from £1.00!"))
    {
        window.open(varURL, "_top");
        return true;
    }
    return false;
}
</script>
<form name="form1" method="post" onSubmit="return ConfirmBasePrice('your_page.php');" action="process_update.asp?id=<%=rsPacking("PPid") %>">


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Cool, thanks