Q285 How do I detect what screen resolution a browser is using?

In Netscape Navigator 4 and Internet Explorer 4 there are new properties that give you better access to the screen/window dimensions.

Netscape Navigator 4:

screen.availHeight - Specifies the height of the screen, in pixels, minus permanent or semipermanent user interface features displayed by the operating system, such as the Taskbar on Windows.
screen.availWidth - Specifies the width of the screen, in pixels, minus permanent or semipermanent user interface features displayed by the operating system, such as the Taskbar on Windows.
screen.colorDepth - The bit depth of the color palette, if one is in use; otherwise, the value is derived from screen.pixelDepth.
screen.height - Display screen height.
screen.pixelDepth - Display screen color resolution (bits per pixel).
screen.width - Display screen width.
window.innerHeight - Specifies the vertical dimension, in pixels, of the window's content area.
window.innerWidth - Specifies the horizontal dimension, in pixels, of the window's content area.
window.outerHeight - Specifies the vertical dimension, in pixels, of the window's outside boundary.
window.outerWidth - Specifies the horizontal dimension, in pixels, of the window's outside boundary.
window.pageXOffset - Provides the current x-position, in pixels, of a window's viewed page.
window.pageYOffset - Provides the current y-position, in pixels, of a window's viewed page.

Microsoft Internet Explorer 4:

screen.bufferDepth - Specifies an offscreen bitmap buffer.
screen.colorDepth - Returns the bits-per-pixel value used for colors on the destination device or buffer.
screen.height - Returns the vertical resolution of the screen, in pixels.
screen.updateInterval - Sets or retrieves the update interval for the screen.
screen.width - Specifies the horizontal resolution of the screen, in pixels.