Generate randomly ordered set of indices in a range.

gistfile1.js

function range(start, end) {
    var indicies = [], out = [];
    for (var i = start; i < end; ++i)
        indicies.push(i);
    while (indicies.length) {
        var index = Math.floor(Math.random() * indicies.length);
        out.push(indicies[index]);
        indicies.splice(index, 1);
    }
    return out;
}