Javascript: Find the index of the smallest element in an array

gistfile1.js

function indexOfSmallest(a) {
    var lowest = 0;
    for (var i = 1; i < a.length; i++) {
        if (a[i] < a[lowest]) lowest = i;
    }
    return lowest;
}

var a = [1, 2, 3, 4, 4, 6, 5, 0, 9];

var result = indexOfSmallest(a);

console.log(result);  // 7