/************************************************************************/
/* Rainbow Links Version 1.03 (2003.9.20)                               */
/* Script updated by Dynamicdrive.com for IE6                           */
/* Copyright (C) 1999-2001 TAKANASHI Mizuki                             */
/* takanasi@hamal.freemail.ne.jp                                        */
/*----------------------------------------------------------------------*/
/* Read it somehow even if my English text is a little wrong! ;-)       */
/*                                                                      */
/* Usage:                                                               */
/*  Insert '<script src="rainbow.js"></script>' into the BODY section,  */
/*  right after the BODY tag itself, before anything else.              */
/*  You don't need to add "onMouseover" and "onMouseout" attributes!!   */
/*                                                                      */
/*  If you'd like to add effect to other texts(not link texts), then    */
/*  add 'onmouseover="doRainbow(this);"' and                            */
/*  'onmouseout="stopRainbow();"' to the target tags.                   */
/*                                                                      */
/* This Script works with IE4,Netscape6,Mozilla browser and above only, */
/* but no error occurs on other browsers.                               */
/************************************************************************/

////////////////////////////////////////////////////////////////////
// Setting

var rate = 20;  // Increase amount(The degree of the transmutation)

////////////////////////////////////////////////////////////////////
// Main routine

if (document.getElementById)
window.onerror=new Function("return true")

var objActive;  // The object which event occured in
var act = 0;    // Flag during the action
var elmH = 0;   // Hue
var elmS = 128; // Saturation
var elmV = 255; // Value
var clrOrg;     // A color before the change
var TimerID;    // Timer ID

if (document.all) {
document.onmouseover = doRainbowAnchor;
document.onmouseout = stopRainbowAnchor;
}
else if (document.getElementById) {
document.captureEvents(Event.MOUSEOVER | Event.MOUSEOUT);
document.onmouseover = Mozilla_doRainbowAnchor;
document.onmouseout = Mozilla_stopRainbowAnchor;
}

// doRainbow
// This function begins to change a color.

function doRainbow(obj)
{
if (act == 0) {
act = 1;
if (obj)
objActive = obj;
else
objActive = event.srcElement;
clrOrg = objActive.style.color;
TimerID = setInterval("ChangeColor()",100);
}
}

// stopRainbow
// This function stops to change a color.
function stopRainbow()
{
if (act) {
objActive.style.color = clrOrg;
clearInterval(TimerID);
act = 0;
}
}

// doRainbowAnchor
// This function begins to change a color. (of a anchor, automatically)
function doRainbowAnchor()
{
if (act == 0) {
var obj = event.srcElement;
while (obj.tagName != 'A' && obj.tagName != 'BODY') {
obj = obj.parentElement;
if (obj.tagName == 'A' || obj.tagName == 'BODY')
break;
}

if (obj.tagName == 'A' && obj.href != '') {
objActive = obj;
act = 1;
clrOrg = objActive.style.color;
TimerID = setInterval("ChangeColor()",100);
}
}
}

// stopRainbowAnchor
// This function stops to change a color. (of a anchor, automatically)
function stopRainbowAnchor()
{
if (act) {
if (objActive.tagName == 'A') {
objActive.style.color = clrOrg;
clearInterval(TimerID);
act = 0;
}
}
}

// Mozilla_doRainbowAnchor(for Netscape6 and Mozilla browser)
// This function begins to change a color. (of a anchor, automatically)
function Mozilla_doRainbowAnchor(e)
{
if (act == 0) {
obj = e.target;
while (obj.nodeName != 'A' && obj.nodeName != 'BODY') {
obj = obj.parentNode;
if (obj.nodeName == 'A' || obj.nodeName == 'BODY')
break;
}

if (obj.nodeName == 'A' && obj.href != '') {
objActive = obj;
act = 1;
clrOrg = obj.style.color;
TimerID = setInterval("ChangeColor()",100);
}
}
}

// Mozilla_stopRainbowAnchor(for Netscape6 and Mozilla browser)
// This function stops to change a color. (of a anchor, automatically)
function Mozilla_stopRainbowAnchor(e)
{
if (act) {
if (objActive.nodeName == 'A') {
objActive.style.color = clrOrg;
clearInterval(TimerID);
act = 0;
}
}
}

// Change Color
// This function changes a color actually.
function ChangeColor()
{
objActive.style.color = makeColor();
}

// makeColor
// This function makes rainbow colors.
function makeColor()
{
// Don't you think Color Gamut to look like Rainbow?

// HSVtoRGB
if (elmS == 0) {
elmR = elmV;    elmG = elmV;    elmB = elmV;
}
else {
t1 = elmV;
t2 = (255 - elmS) * elmV / 255;
t3 = elmH % 60;
t3 = (t1 - t2) * t3 / 60;

if (elmH < 60) {
elmR = t1;  elmB = t2;  elmG = t2 + t3;
}
else if (elmH < 120) {
elmG = t1;  elmB = t2;  elmR = t1 - t3;
}
else if (elmH < 180) {
elmG = t1;  elmR = t2;  elmB = t2 + t3;
}
else if (elmH < 240) {
elmB = t1;  elmR = t2;  elmG = t1 - t3;
}
else if (elmH < 300) {
elmB = t1;  elmG = t2;  elmR = t2 + t3;
}
else if (elmH < 360) {
elmR = t1;  elmG = t2;  elmB = t1 - t3;
}
else {
elmR = 0;   elmG = 0;   elmB = 0;
}
}

elmR = Math.floor(elmR).toString(16);
elmG = Math.floor(elmG).toString(16);
elmB = Math.floor(elmB).toString(16);
if (elmR.length == 1)    elmR = "0" + elmR;
if (elmG.length == 1)    elmG = "0" + elmG;
if (elmB.length == 1)    elmB = "0" + elmB;

elmH = elmH + rate;
if (elmH >= 360)
elmH = 0;

return '#' + elmR + elmG + elmB;
}