watch() This Netscape Navigator Specific function is used mostly by script debuggers, and has no returned value. It is, to the scripter (you) basically useless, and is included here for the sake of completeness. syntax: Watch(property, function) Where the property parameter is the name of the object property to be watched, and the function parameter is the name of the function to invoke whenever the watched property changes. It should be noted that the brackets after the function name are not included as the name of the parameter.