[Javascript] How can i enable a hidden check box element to be visible when onChange event occur on another select object ?

[M. Amin]

Dear All,

in my html file i set a check box hidden as <input type=checkbox
style=visibility:hidden >........
and i'd like to trigger its visibility property using java script or by
using any solving idea.

Any help will be appreciated,

Regards,
 M. Amin