Code tạo trỏ chuột có mấy cái vòng chạy xung quanh

<script language="JavaScript">
<!-- Mouse Attack by Kurt Grigg -
/>var num=10;//Number of dots!
var vel=20;//Speed!
var col=new Array('#0080ff','#ffffff','#0000ff','#44ccff');//Dot colours, min
2!
var stopafter=60; //Stop and clear after x secondS!
//Nothing needs altering past here....................
var MAy=0;
var MAx=0;
var py=0;
var px=0;
var angle=0;
var distance=0;
var rep;
var ry=0;
var rx=0;
var tmr=null;
var n4=(document.layers);
var n6=(document.getElementById&&!document.all);
var ie=(document.all);
var o6=(navigator.appName.indexOf("Opera") != -1)?true:false;
var _d=(n4||ie)?'document.':'document.getElementById(" ';
var _a=(n4||n6)?'':'all.';
var _r=(n6)?'")':'';
var _s=(n4)?'':'.style';
var v=(n4)?"show":"visible";
var put=false;
stopafter*=1000;
if (n4||n6){
window.captureEvents(Event.MOUSEMOVE);

function mouse1(e){
if (put) return false;
MAy = e.pageY-window.pageYOffset;
MAx = e.pageX;
}
if (n4) window.onMouseMove=mouse1;
else document.onmousemove=mouse1;
}
if (ie||o6){
function mouse2(){
if (put) return false;
MAy = (ie)?event.clientY:event.clientY-window.pageYOffset;
MAx = event.clientX;
}
document.onmousemove=mouse2;
}
if (n4){
for (inc=0; inc < num; inc++)
document.write('<layer name=dots'+inc+' top=0 left=0 width='+inc/3+'
height='+inc/3+' bgcolor=#ffffff></layer>');
}
else{
if (ie&&!o6){
document.write("<div id='outer' style='position:absolute;top:0px;left:0px'>");
document.write("<div style='position:relative'>");
}
for (inc=0; inc < num; inc++)
document.write('<div id="dots'+inc+'"
style="position:absolute;top:0px;left:0px;width:'+
inc/3+';height:'+inc/3+';background:#ffffff;font-size:1">.</div>');

if (ie&&!o6) document.write("</div></div>");
}
function pos(){
h=(ie)?document.body.clientHeight:window.innerHeig ht-20;
w=(ie)?document.body.clientWidth:window.innerWidth-20;
ry=Math.round(Math.random()*h);
rx=Math.round(Math.random()*w);
rep=Math.round(Math.random()*3);
if (rep == 3)ry=0;
if (rep == 2)ry=h;
if (rep == 1)rx=0;
if (rep == 0)rx=w;
py=ry;
px=rx;
}
pos();
function followleader(){
sy=(!ie)?window.pageYOffset:0;
sx=(!ie)?window.pageXOffset:0;
if (ie) outer.style.top=document.body.scrollTop;
for (inc=0; inc < num; inc++){
randomcol=col[Math.floor(Math.random()*col.length)];
temp1=eval(_d+_a+"dots"+inc+_r+_s);
temp1.visibility=v;
if (inc < num-1){
temp2=eval(_d+_a+"dots"+(inc+1)+_r+_s);
temp1.top=temp2.top;
temp1.left=temp2.left
}
else{

temp1.top=py+sy;
temp1.left=px;
}
if (n4)temp1.bgColor=randomcol;
else temp1.background=randomcol;
}
}
function bomb(){
ay=MAy-py;
ax=MAx-px;
angle=Math.round(Math.atan2(ay,ax)*180/Math.PI);
if (angle < 0) angle += 360;
MAdy=py-MAy;
MAdx=px-MAx;
distance=Math.floor(Math.sqrt(MAdx*MAdx+MAdy*MAdy) );
go_y = Math.round(vel*Math.sin(angle*Math.PI/180));
go_x = Math.round(vel*Math.cos(angle*Math.PI/180));
py+=go_y;
px+=go_x;
if (distance < vel) pos();
followleader();
tmr=setTimeout("bomb()",20);
}
bomb();
function dsbl(){
v=(n4)?"hide":"hidden";
put=true;
MAx=0;
MAy=0;
setTimeout('clearTimeout(tmr)',stopafter+100);

}
setTimeout('dsbl()',stopafter);
//-->
</script>