This property is supported on Netscape Navigator and tells you what the current width of the outer bordered area of the window is set to.
Assigning a value to this property will resize the window on Netscape Navigator. On MSIE it will be ignored.
Note that the content window will be much smaller than the bordered area. The content area can be controlled directly with the innerHeight and innerWidth properties.
Your script will need to be granted the UniversalBrowserWrite privilege to allow it to set the window size to less than 100x100 pixels.