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This JavaScript creates a smooth and stunning gradient background animation between selectable colors or random colors.

Label: Gradient Background Fader with multicolors

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<script>
// Gradient Background Fader, Multicolor
///////////////////////////////////////////////////////////////////////////
// CONFIGURATION STARTS HERE
///////////////////////////////////////////////////////////////////////////

// Author: Peter Gehrig 
// Web Site: http://www.24fun.com 


// 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 
var ie4=document.all&&!document.getElementById
var ie5=document.all&&document.getElementById&&!browserinfos.match(/Opera/)
var ns4=document.layers
var ns6=document.getElementById&&!document.all
var opera=browserinfos.match(/Opera/)  
var browserok=ie4||ie5||ns4||ns6||opera

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()
}

function changefromto() {
	rgbrednow=rgbrednow-((rgbredfrom-rgbredto)/speed)
	rgbgreennow=rgbgreennow-((rgbgreenfrom-rgbgreento)/speed)
	rgbbluenow=rgbbluenow-((rgbbluefrom-rgbblueto)/speed)
	
	rgbrednow_b=rgbrednow_b-((rgbredfrom_b-rgbredto_b)/speed)
	rgbgreennow_b=rgbgreennow_b-((rgbgreenfrom_b-rgbgreento_b)/speed)
	rgbbluenow_b=rgbbluenow_b-((rgbbluefrom_b-rgbblueto_b)/speed)
	
	if (rgbrednow>255) {rgbrednow=255}
	if (rgbrednow<0) {rgbrednow=0}
	if (rgbgreennow>255) {rgbgreennow=255}
	if (rgbgreennow<0) {rgbgreennow=0}
	if (rgbbluenow>255) {rgbbluenow=255}
	if (rgbbluenow<0) {rgbbluenow=0}
	
	if (rgbrednow_b>255) {rgbrednow_b=255}
	if (rgbrednow_b<0) {rgbrednow_b=0}
	if (rgbgreennow_b>255) {rgbgreennow_b=255}
	if (rgbgreennow_b<0) {rgbgreennow_b=0}
	if (rgbbluenow_b>255) {rgbbluenow_b=255}
	if (rgbbluenow_b<0) {rgbbluenow_b=0}
	
	if (i_step<=speed) {
      	redcol_1 = hexc[Math.floor(rgbrednow/16)];
     	redcol_2 = hexc[Math.floor(rgbrednow)%16];
	 	greencol_1 = hexc[Math.floor(rgbgreennow/16)];
      	greencol_2 = hexc[Math.floor(rgbgreennow)%16];
	  	bluecol_1 = hexc[Math.floor(rgbbluenow/16)];
      	bluecol_2 = hexc[Math.floor(rgbbluenow)%16];
		
		redcol_1_b = hexc[Math.floor(rgbrednow_b/16)];
     	redcol_2_b = hexc[Math.floor(rgbrednow_b)%16];
	 	greencol_1_b = hexc[Math.floor(rgbgreennow_b/16)];
      	greencol_2_b = hexc[Math.floor(rgbgreennow_b)%16];
	  	bluecol_1_b = hexc[Math.floor(rgbbluenow_b/16)];
      	bluecol_2_b = hexc[Math.floor(rgbbluenow_b)%16];
	  	var backcolor="#"+redcol_1+redcol_2+greencol_1+greencol_2+bluecol_1+bluecol_2
		var backcolor_b="#"+redcol_1_b+redcol_2_b+greencol_1_b+greencol_2_b+bluecol_1_b+bluecol_2_b
		if (ie5 && gradient_effect!="none") {
			if (gradient_effect=="horizontal") {var gr_effect=1}
			if (gradient_effect=="vertical") {var gr_effect=0}
	  		document.body.style.filter=
"progid:DXImageTransform.Microsoft.Gradient(startColorstr="+backcolor+", endColorstr="+backcolor_b+", GradientType="+gr_effect+")"
		}
		else {
	  		document.bgColor=backcolor 
		}

		i_step++
		var timer=setTimeout("changefromto()",pausesteps);
	
    } 
  	else {
  		clearTimeout(timer)
		i_step=1
		i_loop++
		if (i_loop<i_loopmax) {var timer=setTimeout("translateintorgb()",pausebetweencolors);}
  	}
}


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