Indeed flash is a good way of making a visual representation of what you want.
Where it gets tricky will be sending that data to an email address to record the specs for the umbrella...it is definately doable - but will take some thinking and some decent understanding of flash/
php.
So, to get you started in creating the user interface please check out this:
For the umbrella....
http://www.kirupa.com/developer/acti...t/dragdrop.htm
For sending it to an email...
Post again with any questions, combining the two of these will take some thinking...
http://www.kirupa.com/developer/acti..._php_email.htm
Cheers,
Scott