[mapserver-users] Pre-defined Zoom In/Zoom Out buttons...

[Mike Smith]

Sorry to bother everyone with this, I know this has been addressed 
before in the archives, but I can't seem to find it when I search them.

I'm trying to enable a Zoom In/Zoom Out bar along side my map (kinda 
like Mapquest or Yahoo maps) where there are buttons that either zoom 
the user in or out to pre-determined levels.  I've got Javascript code 
that zooms in and out ok, but the logic is what's throwing me off.  I 
want the bottom button to always be the same view, not zoom them out 15 
times from whatever their present view is.... it should zoom them out 15 
times from full extent.  I want "full extent" to be the base and each 
button whether it's a zoom in or out button needs to always zoom them to 
the same factor relative to full extent, not their current view...make 
sense?  I know I've seen a Mapserver page before that had this little 
zoom bar that I'm describing, but I can't remember where I saw it. 
 Anybody have a web page that does this?  Or example code that handles 
the logic of pre-defined absolute zoom levels (as opposed to the 
relative ones that the CGI variable "zoom" sets)?

Thanks