IE 6 named anchor and CFlocation error and workaround

A co-worker (Matt) and I stumbled on to this issue for a second time this AM while the boss was giving a demo for the client of a new feature added to the client's site. I am fairly sure that I remember seeing this before and had almost entirely forgotten about it. I figureit is time to blog about and share what we found and maybe I can remember it next time.

We have a page the does some stuff then cflocates off to another page with a url.ID var and a named anchor. This page would always throw an error when you use IE, but if you simply hit reload on IE the error would go away. The error would be a result of the url.ID var and the named anchor getting mashed together during the CFloaction.

This issue seems to only show up when IE 6, cflocation, named anchors and a query string value are used together.

<cfif not isdefined('url.id')>
    <cflocation URL="#GetFileFromPath(cgi.script_name)#?id=1234##top" addtoken="false">
<cfelse>
    <cfdump var="#url#">
</cfif>

So far, the only workaround I have found is to use a & (amper sign) just before the named anchor.

<cflocation URL="#GetFileFromPath(cgi.script_name)#?id=1234&##top" addtoken="false">

After I started looking into this problem I see Ray Camden wrote about the issue about a year ago.
http://ray.camdenfamily.com/index.cfm/2005/10/8/IIS6-Bug-with-CFLOCATION