FF Radio Group Values and Conditional?

I’m trying to get control the display of images on a page using a conditional based on the value of an FF Radio Group custom field. The two options for that field are Vertical and Horizontal.

If I use an FF Checkbox Group custom field – which isn’t ideal since this is an either/or situation – the code below works perfectly but if I use an FF Radio Group custom field, nothing displays.

Here’s my code…

{exp:weblog:entries weblog="members_photos"}
  {if {members_photo_size:selected option="Vertical"}}
  {!-- Display image using IMG_SIZER with height value set --}
  {/if}
  {if {members_photo_size:selected option="Horizontal"}}
  {!-- Display image using IMG_SIZER with width value set --}
  {/if}
{/exp:weblog:entries}

It seems to be that since a radio button and a checkbox are so closely related – the only difference being that with a radio button group only one choice can be selected – that surely the code for displaying content based on the field setting should be the same?

UPDATE Seems to is doable by using

{exp:weblog:entries weblog="members_photos"}
  {if members_photo_size=="Vertical"} 
   {!-- Display image using IMG_SIZER with height value set --}
  {/if}
{if members_photo_size=="Horizontal"}
  {!-- Display image using IMG_SIZER with width value set --}
  {/if}
{/exp:weblog:entries}

Must not have had enough caffine in me. Feel free to close this thread.