var ShowAndHide = {
    init: function() {
        document.getElementById('id_type').onchange = new Function('ShowAndHide.change(); return false;');
        var newValue = document.getElementById('id_type').value;
        if (newValue != 'eth') {
            CollapsedFieldsets.show(1);
        } 
    },
    change: function() {
        var newValue = document.getElementById('id_type').value;
        if (newValue == 'eth') {
            CollapsedFieldsets.hide(1);
        } else {
            CollapsedFieldsets.show(1);
        }
    }
}

addEvent(window, 'load', ShowAndHide.init);