Zend_Form: Element grouping

Hi,

I have a question which might be similar to Axel's one from yesterday but
I'm not really sure.

My goal is to create a form for entering personal information. Among this
information is street name and street number which should be two fields,
displayed next to each other. Phone number entry is made of two entries as
well (prefix and actual phone number) which should also be displayed next
to each other.

The form should look like this:

First name  : [------------]
Last name   : [------------]
Street/ No. : [-------] [--]
City        : [------------]
Phone No.   : [--] [-------]

What feature would you use to implement this? Would you create a display
groups (and with which decorator) or would you rather create a new
Zend_Form_Element class 'MyFormElementPhoneNo' resp.
'MyFormElementStreetNo' that show two text fields in one row?

I couldn't find more similar posts and answers in the list but what be
happy if you would just point me to earlier solutions.

cheers,

Stephan