<input type=button name="a" onclick="changecolor(this,'blue')">
<script>
function changecolor(inputbox, inputcolor){
inputbox.style.background=inputcolor;}
</script>
<script>
function changecolor(inputbox, inputcolor){
inputbox.style.background=inputcolor;}
</script>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>无标题文档</title>
<script language="JavaScript" type="text/JavaScript">function change(){
var u=0
var a=document.getElementsByName("radio1")
for(i=0;i<a.length;i++)
{
if(a[i].checked){u=a[i].value}
}switch(parseInt(u)){
case 1:
document.bgColor="#ff0000"
break;
case 2:
document.bgColor="#ffff00"
break;
case 3:
document.bgColor="#00ff33"
break;
}}</script></head><body><form action="" method="post" name="form1">
<input name="radio1" type="radio" value="1">a
<input name="radio1" type="radio" value="2">b
<input name="radio1" type="radio" value="3">c
<input name="button" type="button" onClick="change()" value="change1">
</form>
</body>
</html>