Sets or retrieves the mouse button pressed by the user. 
Syntax
event.button [ = iWhichButton ]
Possible Values
| iWhichButton | Integer that
specifies or receives one of the following values.| 0 | Default. No button is pressed. |  | 1 | Left button is pressed. |  | 2 | Right button is pressed. |  | 3 | Left and right buttons are both pressed. |  | 4 | Middle button is pressed. |  | 5 | Left and middle buttons both are pressed. |  | 6 | Right and middle buttons are both pressed. |  | 7 | All three buttons are pressed. |  
  | 
The property is read/write.
The property has a default value of 
0.
Expressions can be used in place of the preceding value(s), as of Microsoft® Internet Explorer 5.  For more information, see About Dynamic Properties.
Remarks
The property is read-only in Microsoft® Internet Explorer 4.0, and read/write in Internet Explorer 5 and later.
This property is used with the onmousedown, onmouseup, and onmousemove events. For other events, it defaults to 0 regardless of the state of the mouse buttons. 
Standards Information
There is no public standard that applies to this property.
Applies To