JS控制按钮自动切换背景颜色(可暂停)

<html> 
<head> 
<title>JS控制按钮自动切换背景颜色，可暂停_脚本之家</title> 
<style type="text/css"> 
.grigg{ 
position:relative; 
font-family:Verdana; 
font-size:16px;color:#ffffff; 
} 
</style> 
<script language="JavaScript"> 
y=" "; 
function colourWrite(){ 
y=document.bgColor; 
if (document.layers) 
{x=document.FM.box.value} 
if (document.all) 
{x=document.all.kurt.innerHTML} 
r=x+=y.toUpperCase(); 
Wrte=r+" ";

if (document.layers) 
{ 
document.FM.box.value=Wrte; 
document.layers.kurt.document.open(); 
document.layers.kurt.document.write(""+Wrte+""); 
document.layers.kurt.document.close(); 
} 
if (document.all) 
document.all.kurt.innerHTML= Wrte; 
} 
</script> 
<script language="JavaScript"> 
var amount=0; 
function counter(){ 
var colourElements="0123456789ABCDEF"; 
var Split=colourElements.split(''); 
for (i=0; i < Split.length; i++) 
var a=Math.round(Math.random()*[i]); 
var b=Math.round(Math.random()*[i]); 
var c=Math.round(Math.random()*[i]); 
var d=Math.round(Math.random()*[i]); 
var e=Math.round(Math.random()*[i]); 
var f=Math.round(Math.random()*[i]); 
var G=Split[a]; 
var H=Split[b]; 
var I=Split[c]; 
var J=Split[d]; 
var K=Split[e]; 
var L=Split[f]; 
//stop error! 
if ((G == null)||(H == null)||(I == null)||(J == null)||(K == null)||(L == null)) 
counter(); 
else 
{ 
var RandomColour=G+H+I+J+K+L; 
document.bgColor=RandomColour; 
amount++; 
TMR=setTimeout('counter()',1500) 
} 
} 
//--> 
</script> 
</head> 
<body> 
<FORM NAME=FM> 
<INPUT TYPE=BUTTON VALUE="开始变色" onClick="counter()"> 
<INPUT TYPE=BUTTON VALUE="暂停变色" onClick="window.clearTimeout(TMR)"> 
<INPUT TYPE=BUTTON VALUE=" 获取颜色值 " onClick="colourWrite()"> 
<INPUT TYPE=hidden name=box> 
</FORM>

[Ctrl+A 全选注:如需引入外部Js需刷新才能执行]