OpenLayers: Create button to check/ uncheck all layers -

has create, or know how 1 might go creating openlayer map button check/uncheck overlays?

i have map several overlays, , make easier user able uncheck layers @ once.

thanks

call hidealloverlays , showalloverlays button callback.

// untested function setalloverlaysvisibility(map, status) {    var layers = map.layers;    (var = 0; i<layers.length; ++i) {         var layer = layers[i];         if (!layer.isbaselayer) {            layer.setvisiblity(status);         }    } }  function hidealloverlays(map) {    setalloverlaysvisibility(map, false); }  function showalloverlays(map) {    setalloverlaysvisibility(map, true); }