Warnings:

• Some reference works refer to the visibility property of the Bar object, possibly due to early prototype versions of the Netscape browser or in an attempt to document forthcoming features of the browser. In between publishing and release of the browser, the property changed its name to the visible property.

• You may even then have some difficulty in getting it to work on some platforms but you do need to make sure you are trying to set the correct property value when changing the visibility of Bar objects.