[OpenLayers] Register map click event

[yo_haha]

Hi,

I have an OpenLayers.Map() object on which I'd like to register a click event. For that, I do the following:

// This function has to be declared outside map.events.on() in order to be able to unregister the map click.
var mafnc = function(e){...};   

// Map click event registration 
map.events.on({
 	click : mafnc 
});

// Map click event unregistration
map.events.un({
 	click : mafnc 
});

The problem is the following error:

TypeError: d.func.apply is not a function

If I use, instead, the following code, I get no error. The inconvenient is that unregistration of the map click becomes impossible (?):

map.events.on({
 	click : function(e){...} 
});

Do you have any hint about how to use the first code snippet without getting the error?

Best regards.

[holyhttp]

Your snippet does not show any variable or function named func. I can only see mafnc.

[yo_haha]

Thanks holyhttp for your response.
In fact, Firebug says that the error is detected in the OpenLayers.js file (which is the OpenLayers file Library).
I did not mention that I'm using ExtJS in my application. So the code illustrated above is inside Ext.onReady(function(){...});
The complete error text is :

TypeError: d.func.apply is not a function
anonymous()                                                                                                     OpenLayers.js (ligne 62)
...]);return function(){var d=c.concat(Array.prototype.slice.apply(arguments,[0]));...    OpenLayers.js (ligne 62)