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JS5023  -  MICROSOFT
Function does not have a valid prototype object The code uses instanceof to determine if an object was derived from a particular function class, but the code redefined the object's prototype property as either null or an external object type (both not valid JScript objects). An external object can be an object from the host object model (for example, Internet Explorer's document or window object), or an external COM object.
Ensure the function's prototype property refers  ...  Login to see more
JScript Run-time Errors
 

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