checking radio buttons

hi,
i have two radio buttons - 'yes' and 'no'. they have a name as 
'fixed'. Depending on the value of 'fixed' either 'yes' or 'no' 
should be checked. I tried this:

<input type="radio" name="fixed" tal:condition="options/fixed" 
checked/>Yes
 <input type="radio" name="fixed"  tal:condition="not:options/fixed" 
checked />Not Editable</p>

but doesnt work

any easy way of doing this?
          
-- 
regards
kg

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