[XADO]

Доброго времени суток, есть вот такой скрипт. Как для него сделать кнопку ВКЛ/ВЫКЛ или только кнопку отключения.

<script language="JavaScript1.2"> 

grphcs=new Array(6) 
Image0=new Image(); 
Image0.src=grphcs[0]="img.png"; 
Image1=new Image(); 
Image1.src=grphcs[1]="img.png" 
Image2=new Image(); 
Image2.src=grphcs[2]="img.png" 
Image3=new Image(); 
Image3.src=grphcs[3]="img.png" 
Image4=new Image(); 
Image4.src=grphcs[4]="img.png" 
Image5=new Image(); 
Image5.src=grphcs[5]="img.png" 
Amount=8; 
Ypos=new Array(); 
Xpos=new Array(); 
Speed=new Array(); 
Step=new Array(); 
Cstep=new Array(); 
ns=(document.layers)?1:0; 
ns6=(document.getElementById&&!document.all)?1:0; 

if (ns){ 
for (i = 0; i < Amount; i++){ 
var P=Math.floor(Math.random()*grphcs.length); 
rndPic=grphcs[P]; 
document.write("<LAYER NAME='sn"+i+"' LEFT=0 TOP=0><img src="+rndPic+"></LAYER>"); 
} 
} 
else{ 
document.write('<div style="position:absolute;top:0px;left:0px"><div style="position:relative">'); 
for (i = 0; i < Amount; i++){ 
var P=Math.floor(Math.random()*grphcs.length); 
rndPic=grphcs[P]; 
 document.write('<img id="si'+i+'" src="'+rndPic+'" style="position:absolute;top:0px;left:0px; z-index:300;">'); 
} 
document.write('</div></div>'); 
} 
WinHeight=(ns||ns6)?window.innerHeight:window.document.body.clientHeight; 
WinWidth=(ns||ns6)?window.innerWidth-70:window.document.body.clientWidth; 
for (i=0; i < Amount; i++){ 
Ypos[i] = Math.round(Math.random()*WinHeight); 
Xpos[i] = Math.round(Math.random()*WinWidth); 
Speed[i]= Math.random()*2+3; 
Cstep[i]=0; 
Step[i]=Math.random()*0.1+0.05; 
} 
function fall(){ 
var WinHeight=(ns||ns6)?window.innerHeight:window.document.body.clientHeight; 
var WinWidth=(ns||ns6)?window.innerWidth-70:window.document.body.clientWidth; 
var hscrll=(ns||ns6)?window.pageYOffset:document.body.scrollTop; 
var wscrll=(ns||ns6)?window.pageXOffset:document.body.scrollLeft; 
for (i=0; i < Amount; i++){ 
sy = Speed[i]*Math.sin(90*Math.PI/180); 
sx = Speed[i]*Math.cos(Cstep[i]); 
Ypos[i]+=sy; 
Xpos[i]+=sx; 
if (Ypos[i] > WinHeight){ 
Ypos[i]=-60; 
Xpos[i]=Math.round(Math.random()*WinWidth); 
Speed[i]=Math.random()*2+3; 
} 
if (ns){ 
document.layers['sn'+i].left=Xpos[i]; 
document.layers['sn'+i].top=Ypos[i]+hscrll; 
} 
else if (ns6){ 
document.getElementById("si"+i).style.left=Math.min(WinWidth,Xpos[i]); 
document.getElementById("si"+i).style.top=Ypos[i]+hscrll; 
} 
else{ 
eval("document.all.si"+i).style.left=Xpos[i]; 
eval("document.all.si"+i).style.top=Ypos[i]+hscrll; 
} 
Cstep[i]+=Step[i]; 
} 
setTimeout('fall()',20); 
} 

window.onload=fall 
</script>