var result = element.offscreenBuffering; element.offscreenBuffering = value;
The value of the offscreenBuffering property determines how the current document is drawn. When the property is set to true, objects are added to an offscreen buffer. After all objects are drawn, the contents of the offscreen buffer are made visible to the user. When the property is set to false, objects are rendered directly to the screen. By default, Internet Explorer decides when to buffer objects offscreen. In addition, Internet Explorer automatically enables offscreen buffering when Microsoft DirectX-based components are used on the document.
Microsoft Developer Network: [Windows Internet Explorer API reference Article]