onclick radio button show hide div
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Untitled Document</title>
<script type="text/javascript">
function show(str){
document.getElementById('sh2').style.display = 'none';
document.getElementById('sh1').style.display = 'block';
}
function show2(sign){
document.getElementById('sh2').style.display = 'block';
document.getElementById('sh1').style.display = 'none';
}
</script>
</head>
<body>
<p>
<input type="radio" name="r1" id="e1" onchange="show2()"/> I Am New User
<input type="radio" checked="checked" name="r1" onchange="show(this.value)"/> Existing Member
</p>
<div id="sh1">Hello There !!</div>
<p> </p>
<div id="sh2" style="display:none;">Hey Watz up !!</div>
</body>
</html>