javascript document queryCommandState( )

queryCommandState( )	Firefox/Netscape/NN n/a IE 4(Win) Chrome/Safari/DOM n/a
queryCommandState("commandName")
Determines the current state of the named command. Available only in the Win32 platform for IE 4.
Parameters
commandName A case-insensitive string value of the command name.
Returned Value
true if the command has been completed; false if the command has not completed; null if the state cannot be accurately determined.