Routing by POST values

[eluser]dop3[/eluser]
Perfect...
Now, let me say:

What I would like to do is this kind of controller's mapping:

Code:

Value passed via POST (or via GET too, should be the same)

"contr" => "controllerlName"
"task" => "controllerFunctionName"

"var" => "someValue"
...
"foo" => "otherValue"

With the convention that the request (no matter if POST or GET) has to have at least two params (pair key => value), one with key="contr" (that map the controller class) and the other with key="task" (that map the function to call on the controller)...

What would be the best way to do something like this with CI?

Thanks