In a (ugly) javascript I try to test if window.location.replace exists, before I use it:
if(window.location.replace) window.location.replace(href); else window.location.href = href;
I remember trying to do something like that a while ago and finding what you found. Functions are objects, so you should be able to test for the availability of a function that way, but you can't.
I ended up just doing something like this:
<script type="text/javascript" language="javascript1.1">
// the replace() method used here
</script> <script type="text/javascript" language="javascript">
// the window.location method used here
</script>which is ugly but makes sense.
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