html DOM - insertBefore problem

I am frustrated. It appears that one can not use insertBefore to insert
an A node before a DL node. Is that really true?

I *am* able to insert before a <p id="hh"> tag, but not before a <dl
id="hh"> tag.

i am also able to do a body.appendChild with no trouble.

Finally, winIE6 pops an error: 'Invalid argument' at the last snip line
below:

A snip from my code:

****
var newA = document.createElement("A");

var refObj=document.getElementById("hh");

//document.body.appendChild(newA); //works fine
document.body.insertBefore(newA,refObj);// winIE6 error: 'Invalid argument'
****

Any ideas why this is happening Is it me? or is there some rule I've
not been able to find?

Thanks for any help.

P.S. Same problem if I use "div1", a div wrapper around the dl node,
instead of body node.

emichael b.