А так...
<!DOCTYPE html>
<head>
<meta charset="utf-8">
<title>pass validation</title>
<link rel='stylesheet' href='form-style.css' type='text/css' />
</head>
<body>
<div class="mail">
<h2>Input Password and Submit [6 to 20 characters which contain at least one numeric digit, one uppercase and one lowercase letter]</h2>
<form name="form1" action="#">
<ul>
<li><input type='text' name='text1'/></li>
<li class="rq">*Enter numbers only.</li>
<li> </li>
<li class="submit"><input type="submit" name="submit" value="Submit" onclick="return CheckPassword()"/></li>
<li> </li>
</ul>
</form>
</div>
<script type="text/javascript">
function CheckPassword() {
var passw = "rai50";
var reg = new RegExp("^" + passw + "$");
if(reg.test(document.form1.text1.value)) {
document.location.href = "http://www.google.com";
} else {
alert('Wrong...!');
}
return false;
}
</script>
</body>
</html>