Magento Get Options Values for Dropdown

Get dropdown option values

The dropdown value that you want to get an option values.
$sAttributeName

$sAttributeName = 'color';
$optionValues = Mage::getResourceModel('catalog/product')
                ->getAttribute($sAttributeName)
                ->getSource()
                ->getAllOptions(false);

You dont want the empty value in the option values then set the false value for first argument in below function call
getAllOptions(false)