Error Trapping in ASP page from COM object

Hi,
I am developing an ASP application using COM object.The following are the errors When I try to save the information.I want to trap these errors and should be displayed to the user.
How to trap these errors in ASP page ?The COM object is developed by somebody.

Errors:
eW_BO_Lib error '800a13a7'
Operation not allowed for Intersite Orders

eW_BO_Lib error '800a13a5'
Operation not permitted, due to picking or receiving activity on the current order.

Thanks,
Palani.