title: add custom image field for custom options in magento
body: <p>I am working on magento 1.9 version.I want to add a custom image field in drop down of custom options.
  I added a text field using following guide </p>
  
  <p><a href="http://magento.ikantam.com/qa/how-add-custom-attributes-custom-options" rel="nofollow noreferrer">http://magento.ikantam.com/qa/how-add-custom-attributes-custom-options</a></p>
  
  <p>which is working fine.but when I add a file field then it shows in admin but not save image field value in database.</p>
  
  <p><img src="https://i.stack.imgur.com/zgdR6.png" alt="enter image description here"></p>
  
  <p>please help me to solve this.</p>