[OpenLayers-Users] Turning default mouse actions on and off

[Nick Whitelegg]

As part of a facility to allow users to calculate the distance by dragging the 
mouse along their route, I would like to turn the default drag action (i.e. 
moving the map) off, and then on again when the user has finished calculating 
the distance.

Turning it off seems easy enough, just do

map.events.remove('mousemove');

but how do I turn it back on again? I'd imagine something like

map.events.register('mousemove', map, defaultMoveAction)

but what should "defaultMoveAction" equal?

Thanks,
Nick