How can save and restore my map's extent with GeoExt?

Question

I'm using GeoExt with OpenLayers and trying to save the extent of the map. while exploring the page, users can be able to save the extent and restore via their browsers.

Here is the point that I'm stuck:

how can I catch mousewheel's actions to save the extent of the map and keep it in cookies?

any ideas?

Answer 1

I've found a solution for my problem.

thanks to Alexandre Dubê :

map.events.on({"moveend": function(e) { 
     alert("map moveend"); 
}, "zoomend": function(e) { 
     alert("map zoomend"); 
}, scope: map}); 

So whenever the zoom or extend of my map changes, I will be able to save the extend information...