Selecting rectangle as a query on a map

[Hoeven, Maarten van der]

Hi list,

I am running MapServer 4.6.0, with PHP Mapscript. All is working well
(with a slightly modified gMap75 demo).

But, I have a question about selecting a rectangle on the map, and to
zoom in to that rectangle. You know what I mean :)

I don't want to run Java applets, as I have to keep the application as
small as possible. 

Does anyone have some pointers how to handle? Are there some
javascript-libraries available? Anyone has an example piece of php-code
in store?

All the best,
Maarten