/* rainbow.js
* Original:  Quak Zhixuan (zhixuan@email.com) -->
* Web Site:  http://www.chs.edu.sg/~991b20 -->

* Modifications:  Jim Cairo (jcairo@mediaone.net) -->
* Result:  Improves color selection, better results -->

* This script and many more are available free online at -->
* The JavaScript Source!! http://javascript.internet.com -->

* -- Insert this into the BODY with appropriate text
*     without the *'s, of course:
* <strong>
* <font face="Verdana" size=+2>
* <script>
* <!--
* makeRainbow("Tipping the Scales in Your Favor");
* // -->
* </script>
* </font>
* </strong>

*/
function createHexArray(n) {
this.length = n;
for (var i = 1; i <= n; i++)
this[i] = i - 1;

this[11] = "A";
this[12] = "B";
this[13] = "C";
this[14] = "D";
this[15] = "E";
this[16] = "F";
return this;
}
hx = new createHexArray(16);

function convertToHex(x) {
if (x < 17) x = 16;
var high = x / 16;
var s = high+"";
s = s.substring(0, 2);
high = parseInt(s, 10);
var left = hx[high + 1];
var low = x - high * 16;
if (low < 1) low = 1;
s = low + "";
s = s.substring(0, 2);
low = parseInt(s, 10);
var right = hx[low + 1];
var string = left + "" + right;
return string;
}

function makeRainbow(text) {
text = text.substring(0, text.length);
color_d1 = 255;
mul = color_d1 / text.length;
for(var i = 0; i < text.length; i++) {
color_d1 = 255*Math.sin(i / (text.length / 3));
color_h1 = convertToHex(color_d1);
color_d2 = mul * i;
color_h2 = convertToHex(color_d2);

k = text.length;
j = k - i;
if (j < 0) j = 0;
color_d3 = mul * j;
color_h3 = convertToHex(color_d3);

document.write("<FONT COLOR=\"#" + color_h3 + color_h1 + color_h2 + "\">" + text.substring(i, i + 1) + "</FONT>");
   }
}