function MakeArray(n)
{
	this.length = n;
	for(var i = 1; i <= n; i++) this[i] = i - 1;
		return this;
}

hex = new MakeArray(16);
hex[11]="A";
hex[12]="B";
hex[13]="C";
hex[14]="D";
hex[15]="E";
hex[16]="F"; 

function ToHex(x)
{
	var high = x / 16;
	var s = high + "";
	s = s.substring(0, 2);
	high = parseInt(s, 10);
	var left = hex[high + 1];
	var low = x - high * 16;
	s = low + ""; 
	s = s.substring(0, 2);
	low = parseInt(s, 10);
	var right = hex[low + 1];
	var string = left + "" + right;
	return string;
}

function rainbow(text)
{
	//text = text.substring(0, text.length);
	color_d1 = 255;
	mul = color_d1 / text.length;
	for(i = 0; i < text.length; i++)
	{
		color_d1 = 255 * Math.sin(i / (text.length / 3));
		//"255*Math.sin(i/(text.length/3))"
		color_h1 = ToHex(color_d1);
		color_d2 = mul * i; 
		color_h2 = ToHex(color_d2);
		document.write("<FONT COLOR='#FF" + color_h1 + color_h2 + "'>" + text.substring(i, i + 1) + '</FONT>'); 
	}
}