please try (not tested) :

    Field('email', 'list:string', represent = lambda email, field: \
            XML(", ".join([A(mail, _title=T("Send to %s") % mail, 
_target="_blank", 
                             _href="mailto:%s"; % mail).xml() for mail in 
email] ) ) if email else ''), 
    Field('website', represent = lambda website, field: \
            A(website, _title = T("View Website"), _target = "_blank", 
_href = "%s" % website) if website else ''), 

and please take a look the book at dal chapter:
http://web2py.com/books/default/chapter/29/06/the-database-abstraction-layer

best regards,
stifan

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