gistfile1.php

    public function getMainImage()
    {
        $mainImage = $this->getSkinUrl('images/pd/bettercontact/contacts-main-image.jpg');

        //Set main image from system config if it exist
        if ($image = Mage::getStoreConfig('contacts/contacts/main_image', Mage_Catalog_Model_Abstract::DEFAULT_STORE_ID)) {
            $mainImage = Mage::getBaseUrl(Mage_Core_Model_Store::URL_TYPE_MEDIA) . 'contacts' . DS . $image;
        }

        return $mainImage;
    }