<html>
<!-- head -->
<head>
<script language="javascript">
function doClick(radio){
if (radio.checked){
document.all.ddd.style.display="block";
}
}
</script>
<title>搜狐首页</title>
</head><body bgcolor=#FFFFFF vlink=#000099 leftmargin=0 topmargin=4>
<input type="radio" name="radio" value="ddd" onclick="doClick(this)">ddd
<input type="radio" name="radio" value="ccc">cccc
<div id="ddd" style="display:none">选中ddd后 才显示</div>
</body>
</html>
<!-- head -->
<head>
<script language="javascript">
function doClick(radio){
if (radio.checked){
document.all.ddd.style.display="block";
}
}
</script>
<title>搜狐首页</title>
</head><body bgcolor=#FFFFFF vlink=#000099 leftmargin=0 topmargin=4>
<input type="radio" name="radio" value="ddd" onclick="doClick(this)">ddd
<input type="radio" name="radio" value="ccc">cccc
<div id="ddd" style="display:none">选中ddd后 才显示</div>
</body>
</html>
<input type="radio" name="r1" onclick="this.form.i1.style.visibility='';this.form.i2.style.visibility='';"><input type="radio" name="r2" onclick="this.form.i1.style.visibility='hidden';this.form.i2.style.visibility='hidden';"><input/select/textarea ... name="i1" style="visibility:hidden">