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refreshing hidden field value based on form value

I have a scenario where I want the user to input an Account ID as text in a field on my form. Then, after they update that field, I want to take that value and save it as the Account__c value which is a hidden field on my form.


Basically I'm looking for a way that a user can identify themselves with an account without being able to see the whole list of accounts out there using the lookup.


How would I modify this field dynamically upon them making that change?