[OpenLayers-Users] remove all layers

[Armin Wäspy]

hi list,
is there a function which removes all displayed layers?
my map has up to 50 layers, named box1....box50. 
 
i tried a for-loop with map.removeLayer('BOX'+i) but this don't work if less than 50 layers rendered.
anybody an idea how i can manage that?
thanks.
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