Free JavaScript: Gradient Background Fader, Multicolors

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Gradient Background Animation, Multicolor
This JavaScript creates a smooth background gradient color animation between a set of selectable colors. You may add as many colors as you like. Easy configuration of speed and effect-type. Crossbrowser: Internet Explorer 5x/6x/7x/8x, Firefox 3.6 or higher, Google Chrome 4x and Opera 7x/8x/9x/10x and (simple color animation without gradients)..

Demo
Click here to test the script.

Configuration:

Step 1: Open your webpage that will display your gradient background fader. Use a simple texteditor (NotePad or WordPad). Frontpage, Dreamweaver, GoLive or Word are not recommended. Insert the following code between the <head>-tag and </head>-tag:

// IMPORTANT:
// If you add this script to a script-library or script-archive
// you have to add a highly visible link to
// http://www.fabulant.com on the webpage
// where this script will be featured

///////////////////////////////////////////////////////////////////////////
// CONFIGURATION STARTS HERE
///////////////////////////////////////////////////////////////////////////

// Select the colors (hexadecimal triplet value required)
// Please note that at least 3 colors are required!
var colors=new Array("#FFFF00","#00FFFF","#5fc700","#854b00","#76e07c","#FFAC00","#FFFF66","#ff0000","#FFFFFF","#850044","#B56AFF","#56B1FF")

// Set pause between colors (seconds)
var pausebetweencolors=2

// What type of gradient should be applied Internet Explorer 5x or higher?
// Set "none" or "horizontal" or "vertical"
var gradient_effect="horizontal"

// Set speed (higher=slower)
var speed=20

// How many times shall the effect be repeated?
// Add a value between 1 and 9999999
var i_loopmax=1000

///////////////////////////////////////////////////////////////////////////
// CONFIGURATION ENDS HERE
///////////////////////////////////////////////////////////////////////////

// do not edit code below this line
var pausesteps=40
var hexc = new Array('0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F')
var redcol_1
var redcol_2 
var redcol_1_b
var redcol_2_b 
var greencol_1 
var greencol_2 
var greencol_1_b 
var greencol_2_b
var bluecol_1 
var bluecol_2 
var bluecol_1_b 
var bluecol_2_b
 
var rgbredfrom
var rgbgreenfrom
var rgbbluefrom
var rgbredto
var rgbgreento
var rgbblueto
var rgbrednow
var rgbgreennow
var rgbbluenow

var rgbredfrom_b
var rgbgreenfrom_b
var rgbbluefrom_b
var rgbredto_b
var rgbgreento_b
var rgbblueto_b
var rgbrednow_b
var rgbgreennow_b
var rgbbluenow_b

var colorhexafrom
var colorhexato

var i_step=1
var i_loop=0
var i_colorsA=0
var i_colorsB=1
var i_colorsC=1
var i_colorsD=2

pausebetweencolors*=1000

var browserinfos=navigator.userAgent.toLowerCase();
var ie4=document.all&&!document.getElementById
var ie5=document.all&&document.getElementById&&!browserinfos.match(/opera/)
var opera=browserinfos.indexOf("opera")!=-1
var chrome=browserinfos.indexOf("chrome")!=-1
var ff36=browserinfos.indexOf("firefox/3.6") !=-1 || browserinfos.indexOf("firefox/.3.6") !=-1 || browserinfos.indexOf("firefox/0.3.6") || browserinfos.indexOf("firefox/3.7") !=-1 || browserinfos.indexOf("firefox/.3.7") !=-1 || browserinfos.indexOf("firefox/0.3.7") || browserinfos.indexOf("firefox/3.8") !=-1 || browserinfos.indexOf("firefox/.3.8") !=-1 || browserinfos.indexOf("firefox/0.3.8") || browserinfos.indexOf("firefox/3.9") !=-1 || browserinfos.indexOf("firefox/.3.9") !=-1 || browserinfos.indexOf("firefox/0.3.9") || browserinfos.indexOf("firefox/4") !=-1 || browserinfos.indexOf("firefox/.4") !=-1 || browserinfos.indexOf("firefox/0.4") !=-1;

var ns4=document.layers
var ns6=document.getElementById&&!document.all&&!browserinfos.match(/opera/)

var browserok=ie4||ie5||ns4||ns6||opera||ff36||chrome

function translateintorgb() {

var hexa=colors[i_colorsA]
	var hexared=hexa.substring(1,3)
	var hexagreen=hexa.substring(3,5)
	var hexablue=hexa.substring(5,7)
	rgbredfrom=parseInt("0x"+hexared)
	rgbgreenfrom=parseInt("0x"+hexagreen)
	rgbbluefrom=parseInt("0x"+hexablue)
	rgbrednow=rgbredfrom
	rgbgreennow=rgbgreenfrom
	rgbbluenow=rgbbluefrom
	
	var hexa=colors[i_colorsB]
	var hexared=hexa.substring(1,3)
	var hexagreen=hexa.substring(3,5)
	var hexablue=hexa.substring(5,7)
	rgbredto=parseInt("0x"+hexared)
	rgbgreento=parseInt("0x"+hexagreen)
	rgbblueto=parseInt("0x"+hexablue)
	
	var hexa=colors[i_colorsC]
	var hexared=hexa.substring(1,3)
	var hexagreen=hexa.substring(3,5)
	var hexablue=hexa.substring(5,7)
	rgbredfrom_b=parseInt("0x"+hexared)
	rgbgreenfrom_b=parseInt("0x"+hexagreen)
	rgbbluefrom_b=parseInt("0x"+hexablue)
	rgbrednow_b=rgbredfrom_b
	rgbgreennow_b=rgbgreenfrom_b
	rgbbluenow_b=rgbbluefrom_b
	
	var hexa=colors[i_colorsD]
	var hexared=hexa.substring(1,3)
	var hexagreen=hexa.substring(3,5)
	var hexablue=hexa.substring(5,7)
	rgbredto_b=parseInt("0x"+hexared)
	rgbgreento_b=parseInt("0x"+hexagreen)
	rgbblueto_b=parseInt("0x"+hexablue)
	i_colorsA++
	i_colorsB++
	i_colorsC++
	i_colorsD++
	if (i_colorsA>=colors.length) {i_colorsA=0}
	if (i_colorsB>=colors.length) {i_colorsB=0}
	if (i_colorsC>=colors.length) {i_colorsC=0}
	if (i_colorsD>=colors.length) {i_colorsD=0}
	
	changefromto()
}

if (browserok) {
	window.onload=translateintorgb
}
</script>

Step 2: Go to the top of the script and configure your favourite background-colors, speed and type of effect.