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Solo hace falta que copies el código entre las etiquetas de <HEAD>..</HEAD> de tu página.
<SCRIPT LANGUAGE="JavaScript">
<!-- Trio 3 Script by kurt.grigg@virgin.net
//Choose colours and size of effect !!
var a_Colour=`fff000`;
var b_Colour=`00ff00`;
var c_Colour=`ff00ff`;
var Size=120;
//Alter nothing below !!
var YDummy=new Array(),XDummy=new Array(),xpos=0,ypos=0,ThisStep=0;step=0.6;
if (document.layers){
window.captureEvents(Event.MOUSEMOVE);
function nsMouse(evnt){
xpos = window.pageYOffset+evnt.pageX+6;
ypos = window.pageYOffset+evnt.pageY+16;
}
window.onMouseMove = nsMouse;
}
else if (document.all)
{
function ieMouse(){
xpos = document.body.scrollLeft+event.x+6;
ypos = document.body.scrollTop+event.y+16;
}
document.onmousemove = ieMouse;
}
function swirl(){
for (i = 0; i < 3; i++)
{
YDummy[i]=ypos+Size*Math.sin((1*Math.sin((ThisStep)/10))+i*2)*Math.sin((ThisStep)/4);
XDummy[i]=xpos+Size*Math.cos((1*Math.sin((ThisStep)/10))+i*2)*Math.sin((ThisStep)/4);
}
ThisStep+=step;
setTimeout(`swirl()`,10);
}
var amount=10;
if (document.layers){
for (i = 0; i < amount; i++)
{
document.write(`<layer name=nsa`+i+` top=0 left=0 width=`+i/2+` height=`+i/2+` bgcolor=`+a_Colour+`></layer>`);
document.write(`<layer name=nsb`+i+` top=0 left=0 width=`+i/2+` height=`+i/2+` bgcolor=`+b_Colour+`></layer>`);
document.write(`<layer name=nsc`+i+` top=0 left=0 width=`+i/2+` height=`+i/2+` bgcolor=`+c_Colour+`></layer>`);
}
}
else if (document.all){
document.write(`<div id="ODiv" style="position:absolute;top:0px;left:0px">`
+`<div id="IDiv" style="position:relative">`);
for (i = 0; i < amount; i++)
{
document.write(`<div id=x style="position:absolute;top:0px;left:0px;width:`+i/2+`;height:`+i/2+`;background:`+a_Colour+`;font-size:`+i/2+`"></div>`);
document.write(`<div id=y style="position:absolute;top:0px;left:0px;width:`+i/2+`;height:`+i/2+`;background:`+b_Colour+`;font-size:`+i/2+`"></div>`);
document.write(`<div id=z style="position:absolute;top:0px;left:0px;width:`+i/2+`;height:`+i/2+`;background:`+c_Colour+`;font-size:`+i/2+`"></div>`);
}
document.write(`</div></div>`);
}
function prepos(){
var ntscp=document.layers;
var msie=document.all;
if (document.layers){
for (i = 0; i < amount; i++)
{
if (i < amount-1)
{
ntscp[`nsa`+i].top=ntscp[`nsa`+(i+1)].top;ntscp[`nsa`+i].left=ntscp[`nsa`+(i+1)].left;
ntscp[`nsb`+i].top=ntscp[`nsb`+(i+1)].top;ntscp[`nsb`+i].left=ntscp[`nsb`+(i+1)].left;
ntscp[`nsc`+i].top=ntscp[`nsc`+(i+1)].top;ntscp[`nsc`+i].left=ntscp[`nsc`+(i+1)].left;
}
else
{
ntscp[`nsa`+i].top=YDummy[0];ntscp[`nsa`+i].left=XDummy[0];
ntscp[`nsb`+i].top=YDummy[1];ntscp[`nsb`+i].left=XDummy[1];
ntscp[`nsc`+i].top=YDummy[2];ntscp[`nsc`+i].left=XDummy[2];
}
}
}
else if (document.all){
for (i = 0; i < amount; i++)
{
if (i < amount-1)
{
msie.x[i].style.top=msie.x[i+1].style.top;msie.x[i].style.left=msie.x[i+1].style.left;
msie.y[i].style.top=msie.y[i+1].style.top;msie.y[i].style.left=msie.y[i+1].style.left;
msie.z[i].style.top=msie.z[i+1].style.top;msie.z[i].style.left=msie.z[i+1].style.left;
}
else
{
msie.x[i].style.top=YDummy[0];msie.x[i].style.left=XDummy[0];
msie.y[i].style.top=YDummy[1];msie.y[i].style.left=XDummy[1];
msie.z[i].style.top=YDummy[2];msie.z[i].style.left=XDummy[2];
}
}
}
setTimeout("prepos()",10);
}
function Start(){
swirl(),prepos()
}
window.onload=Start;
// -->
</SCRIPT>
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