Magento – Get Attribute option Id by Attribute admin value

Please use the following code to get the value from label

$attribute_f = Mage::getModel('eav/config')->getAttribute('catalog_product', 'atr_name');
foreach ( $attribute_f->getSource()->getAllOptions(true, true) as $opt_menuf)
{
    $f_attribute[$opt_menuf['value']] = $opt_menuf['label'];
}

We can use 'depends' tag in system.xml in field which we have to show/hide depends on 'yes/no' field.

Below are syntax you can use:

<depends><enabled>1</enabled></depends>

In above syntax 'enabled' is a field with 'yes/no' values.

Above code is for system >> Configuration settings .

To add any field depends on 'yes/no' in product form you can use below code:

  $productField = $fieldset->addField('enabled', 'select', array(
        'label'     => Mage::helper('adminhtml')->__('Enabled'),
        'title'     => Mage::helper('adminhtml')->__('Enabled'),
        'name'      => 'enabled',
        'options'   => array(
            0 => Mage::helper('adminhtml')->__('No'),
            1 => Mage::helper('adminhtml')->__('Yes'),  
        ),
        'onclick' => 'toggleYesNo()',
    ));
    $productField->setAfterElementHtml('
        <script>
        function toggleFixedShipping() {
           $("idToShowHide").toggle();
        }
        </script>
    ');

Here 'idToShowHide' id will be show/hide field's ID.

I hope it solves your concern.