InfoPath Dev

Does anyone have ideas about code that will query with one domain, if the user is not found, then try another? I was thinking a try-catch block would work but I am still waiting for VB access on my network. I have tried searching around and I can't find anything similar to what I am asking.

Thank you Hilary! Could someone point me in the direction of  what kind of code I would need to use? Basically what I need is a way to query the database, check for an error (invalid user because of domain), if error is produced, then query with other domain. After determination of which domain is valid for the users, the rest of my rules ...

Yeah, I meant the SOAP Web service. Unfortunately I only have read only access. Would there be a way to automatically close or disable the error message? I have already tried querying with the substring-after formula to just pull the user and it errors out on the ones that have a different domain. I just want to slap the people who set up AD users ...

Not sure if this is possible, I do not have the option to modify code in InfoPath, but I am able to query SOAP database to get user information, which is working beautifully but for certain users it does not work. The problem that I have run into, is that some of the members of active directory have a different domain than what the people picker ...