[Javascript] List custom element properties in IE5/IE5.5?

[Hakan M.]

Imagine the following tag, with the custom property:
<div id="myid" mycustom="thisvalue" width="30"> hello </div>

Now, I want a LIST of the attributes DEFINED ON THE TAG, including 
custom attributes. I do not know any of the possible custom attributes 
up front. In Mozilla and Internet Explorer 6, the following function works:

--
oElm = document.getElementById('myid');

var sProp, sVal, bSet;
var aAttribute = new Array();
for(var i=0; i < oElm.attributes.length; i++) {
   
    sProp = oElm.attributes.item(i).nodeName;
    sVal  = oElm.attributes.item(i).nodeValue;
    bSet  = oElm.attributes.item(i).specified ? true : false;
   
    if(bSet) {
        aAttribute[sProp] = sVal;
    }
}
--

Meaning that after I run the loop on my element, aAttribute contains an 
array of properties defined on the element, and  aAttribute['mycustom'] 
is 'thisvalue'.

In Internet Explorer 5.5, however, the custom properties exist in the 
elements "all"-collection (element[PROPNAME]), but only as 
element[PROPNAME] = VALUE, where PROPNAME is just a standard string 
identifyer. Hence, there's no way for me to tell if the 
element[PROPNAME] is a property, a custom property or if it's even 
defined on the tag and not by IE (like element['onmouseover'], 
element['class'] et cetera).

When I try a (slightly more 'friendly') version of the above script in 
IE5/IE5.5 the "specified" attribute, among other things, returns 'false' 
even if the property was indeed set on the element. IE5/IE5.5 can 
SOMETIMES find ONE (of many) custom attributes, but in nine times out of 
ten, the browser crashes badly after finding that first one.

Anybody ever did anything similar?
element.getAttributesOnElement would be a nice method. ;)

Regards,
Hakan