Toggles the text-entry mode between insert and overwrite.
Command OverWrite User interface None. Set bUserInterface to false or omit. execCommand vValue Optional. Boolean that specifies the text-entry mode. If this value is set to true or null, the text-entry mode is overwrite. If this value is set to false (the default), the text-entry mode is insert. Applies to execCommand, queryCommandEnabled, queryCommandIndeterm, queryCommandState, queryCommandSupported, queryCommandValue.
Internet Explorer 4.0 and later.