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If you want to insert multiple elements into an array at once check out this Stack Overflow answer: A better way to splice an array into an array in javascript

Also here are some functions to illustrate both examples:

function insertAt(array, index) {
    var arrayToInsert = Array.prototype.splice.apply(arguments, [2]);
    Array.prototype.splice.apply(array, [index, 0].concat(arrayToInsert));
}

function insertArrayAt(array, index, arrayToInsert) {
    Array.prototype.splice.apply(array, [index, 0].concat(arrayToInsert));
}

Finally here is a jsFiddle so you can see it for youself: http://jsfiddle.net/luisperezphd/Wc8aS/

And this is how you use the functions: insertAt(arr, 1, "x", "y", "z"); var arrToInsert = ["x", "y", "z"]; insertArrayAt(arr, 1, arrToInsert);