var ___rootFound;

function _doSearchForRootWindow () {

        var curWin = window;
        if ((curWin != curWin.parent) && ! curWin.rootMarker){

                // Check for the presence of an arbitrary value that should only exist on the webapp root
                if (curWin.parent.rootMarker) {

                        curWin = curWin.parent;

                } else {
                        // Otherwise call recursively. 
                        // Well, not really recursively because the scope is different, 
                        // but I don't have a better word for it.
                        curWin = curWin.parent.getWebappRoot();
                }
        }

        while (curWin.opener && ! curWin.rootMarker) {

                curWin = curWin.opener.getWebappRoot();
        }
        
        return curWin;
}

function getWebappRoot () {

        if (! ___rootFound)
                ___rootFound = _doSearchForRootWindow ();

        return ___rootFound;
}



function _root(){

        return getWebappRoot();
}