can a magento adminhtml field depend on more then one field or value?

In http://alanstorm.com/magento_system_configuration_in_depth_tutorial @AlanStorm gives a very good tutorial for system configuration.

He also explains how to use a <depends> tag to make a field show only when a specific value is set in another field.

My Q is how can I make fieldB visible if field A has either value V1 or V2. and are there any other options with the <depends> ?

Also If someone knows where in magento's code this is implemented I would also like to have a look at the code myself.

Thanks

There is a better way, but you will need to override the core files

Override the method under the following file app\code\core\Mage\Adminhtml\Block\Widget\Form\Element\Dependence.php

    public function addFieldDependence($fieldName, $fieldNameFrom, $refValues)
{
    /*
    if (is_array($refValues)) {
        Mage::throwException('Dependency from multiple values is not implemented yet. Please fix to your widget.xml');
    }
    */
    $this->_depends[$fieldName][$fieldNameFrom] = $refValues;
    return $this;
}

On the app\code\core\Mage\Adminhtml\Block\System\Config\Form.php Modify the method initFields

if ($e->depends) {
                foreach ($e->depends->children() as $dependent) {
                    $dependentId = $section->getName() . '_' . $group->getName() . '_' . $fieldPrefix . $dependent->getName();
                    if ($dependent->count()) {
                        $dependentValue = (array) $dependent;
                        $dependentValue = array_values($dependentValue);
                    } else {
                        $dependentValue = (string) $dependent;
                    }

                    $this->_getDependence()
                        ->addFieldMap($id, $id)
                        ->addFieldMap($dependentId, $dependentId)
                        ->addFieldDependence($id, $dependentId, $dependentValue);
                }
            }

Modify the javascript file js\mage\adminhtml\form.js

trackChange : function(e, idTo, valuesFrom)
{
    // define whether the target should show up
    var shouldShowUp = true;
    for (var idFrom in valuesFrom) {

        if (valuesFrom.hasOwnProperty(idFrom)) {
            if (typeof(valuesFrom[idFrom])=="object") {
                shouldShowUp = false;
                for(var idVal in valuesFrom[idFrom]) {
                    if (valuesFrom[idFrom].hasOwnProperty(idVal)) {
                        if (typeof(idVal)!="undefined" && ($(idFrom).value == valuesFrom[idFrom][idVal])) {
                            shouldShowUp = true;
                        }
                    }
                }
            } else if (typeof(valuesFrom[idFrom])=="string") {
                if ($(idFrom).value != valuesFrom[idFrom]) {
                    shouldShowUp = false;
                }
            }
        }
        /*
        if ($(idFrom).value != valuesFrom[idFrom]) {
            shouldShowUp = false;
        }
        */
    }

    // toggle target row
    if (shouldShowUp) {
        $(idTo).up(this._config.levels_up).select('input', 'select', 'td').each(function (item) {
            if (!item.type || item.type != 'hidden') { // don't touch hidden inputs, bc they may have custom logic
                item.disabled = false;
            }
        });
        $(idTo).up(this._config.levels_up).show();
    } else {
        $(idTo).up(this._config.levels_up).select('input', 'select', 'td').each(function (item){
            if (!item.type || item.type != 'hidden') { // don't touch hidden inputs, bc they may have custom logic
                item.disabled = true;
            }
        });
        $(idTo).up(this._config.levels_up).hide();
    }
}

Use the following syntax for multiple values dependency on your xml

                            <depends>
                            <field1>
                                <val1>text</val1>
                                <val2>radio</val2>
                            </field1>
                        </depends>