Creating a customer lookup in a web form

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We have 7000 customers in a DB2 table in our ERP system.  Users are use to autocomplete fields where they start typing the name and get a list of possible customers.  Is there any way to replicate this in a web form?   Has anyone tried to use a select drop down with an on change event that pulls the 10 most closely related customers and populates the select drop down?  Something like a user identification lookup but for customers would be awesome