SO jQuery Fiddle

Test Fiddle mainly for SO Questions jQuery 1.4.3, UI 1.8.5

by Nick Craver

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.5/themes/ui-lightness/jquery-ui.css">

JavaScript

var cars ={ Toyata: ['Camry','Prius','Highlander'],
            Honda:  ['Accord', 'Civic', 'Pilot'],
            Nissan: ['Altima', 'Sentra', 'Quest']};

function getManufacturer(carName) {
    for(var key in cars) {
        if(cars.hasOwnProperty(key)) {
           for(var i=0; i<cars[key].length; i++) {
              if(cars[key][i] == carName) return key;
           }
        }
    }
    return "Not found";
}
    
alert(getManufacturer("Accord"));