getElementsBySelector(selector, elementWhereToFind) needed

Hey Ben, I will email you the script, but I have fixed this.

The bulk of the code modification is the following addition
of a helper
function. If people can attest that it works on many
browsers, then
everything else is easy.

What's the custom here? do I just paste the code in here? or
send
someone an email?

//  helper recursion function
//  determines if root is a parent of el
function getChildElementById_( el, current , root)
{
    if( current == root )
        return el;
    if( current == null )
        return null;
    return getChildElementById_( el, current.parentNode,
root );

}

//  does the equivalent of root.getElementById() by
verifying if
//  root is the ancestor of document.getElementById(id)
function getChildElementById(id, root)
{
    var el = document.getElementById( id );
    if( !el )
        return el;
    return getChildElementById_( el, el, root );
}