How to properly format text in sheet on OS X?

[Brian K. Maher]

> Hi Folks,
>
> I am trying to properly format the text in an 'answer ... as sheet' 
> command.  I need to message text to conform to OS X's UI guidelines 
> which state that the 'message text' should use the emphasized bold 
> system font and the 'informative text' should use the small system 
> font.  Below is my command so far but the fonts don't seem to be 
> working:
>
> answer warning "<font face='Lucida Grande' size='13'><b>message 
> text</b><br><br></font><font face='Lucida Grande' 
> size='11'>informative text</font>" with "Continue" as sheet
>
> Can anyone help me get this working properly?
>
> Thanks, Brian