It looks like you are out of luck.
If you look at MSDN: Key Differences Between Visual Basic for Applications and VBScript
] at the bottom, under "System Objects" you will find this message:
"Although Visual Basic for Applications supports the Screen, Printer, App, Debug, Err, and Clipboard objects, VBScript supports only the Err object. Therefore, VBScript does not allow you to access such useful objects as the mouse pointer or the clipboard. You can, however, use the Err object to provide runtime error handling for your applications."
You will probably have to find some other way to achieve your ends.