Turns the stock OpenCart header search field into a live search. Results appear in a dropdown as the shopper types: product thumbnail, name with the matched term highlighted, price (tax and currency correct, specials struck through) and the product's category. Fully keyboard driven — arrow keys move through results, Enter opens, Escape closes. Result count, minimum characters and the typing debounce are all configurable, and the endpoint reuses OpenCart's own catalog product model so results match the full search page exactly. With JavaScript disabled the form still submits as a plain GET search, so nothing is ever lost.