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Declare an array

var myArray = new Array("one", "two", "three");

Declare an array with keys

var myArray = new Array();
myArray('firstName') = 'Dave';
myArray('lastName') = 'Ramlakhan';
myArray('dob') = '15 May 1964';

Slice element one to four from an Array

var sliceOfArray = FullArray.slice(1,4);

Join two arrays

var JoinedArray = arrayOne.concat(arrayTwo, arrayThree);

Convert an array to a string

var myString = arrayOne.join(', ');

Split a string to an array

var myArray = myString.split(', ');

Use sort() method to sort an array and reverse() to reverse sort

Select an image to display at random

<script type="text/javascript">
var bannerImages = new Array();
bannerImages[0] = "Banner1.jpg";
bannerImages[1] = "Banner2.jpg";
bannerImages[2] = "Banner3.jpg";
bannerImages[3] = "Banner4.jpg";
bannerImages[4] = "Banner5.jpg";
bannerImages[5] = "Banner6.jpg";
bannerImages[6] = "Banner7.jpg";
bannerImages[7] = "Banner8.jpg";
var randomImageIndex = Math.round(Math.random() * 7);
document.write('<img alt="" src="' + bannerImages[randomImageIndex] + '">');
</script>