MS Internet Explorer does not work with objects derived from Array()   spacer
  This is a javascript example of an object derived from Array(): 
function PaletteList(preselected) {
//	the arguments after 'preselected' are palette names
	var last = arguments.length - 1
	for(var i=0; i < last; i++)
		this[i] = arguments[i + 1]
	this.name = 'palettes'
	this.preselected = preselected
}
PaletteList.prototype = new Array

colourPalette = new PaletteList(1, 'spring', 'summer', 'autumn')
A reference like colourPalette[2] will cause an error if run in a script with MS Internet Explorer and you will find out that 'colourPalette' is empty.
How it was solved   spacer
  The only way around is to internalise the array as shown here after: 
function PaletteList(preselected) {
//	the arguments after 'preselected' are palette names
	var last = arguments.length - 1
	this.option = new Array(last)
	for(var i=0; i < last; i++)
		this.option[i] = arguments[i + 1]
	this.name = 'palettes'
	this.preselected = preselected
}
now colourPalette.option[n] will find the data.
You have to avoid using PaletteList.prototype = new Array if you intend to add other properties to the object.