Drop Down history in form fields

Hi.
I have written my own js code for a dropdown form-field list based on a MySQL database table search against live typing into this form field.
Problem is, my browsers all remember what I typed there before and now there is a conflict where the history list drops down over mine. My program depends upon the direct clicking of a row in my own js list but since this is covered with the history list, it does not work.
How can I fix this?
Is there a way to programmatically disable the cached list? Or is there some better way to go about it?

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