function propagateAnatomyConstraint(anchor) 
{
        if (!anchor) {
                return false;
        }
        var anatConstraintSelect = document.getElementById('anat_constraint');

        var idx = anatConstraintSelect.selectedIndex;
        if (anatConstraintSelect && idx > 0) {
                anchor.href += "&anat_constraint=" + escape(anatConstraintSelect.options[idx].value);
        }
        return true;
}