<html>
<head>
<script language="javascript" type="text/javascript">

function login_mag()
{

var name=document.form1.name.value;
var paswd=document.form1.password.value;

 if(name=="" || paswd=="")
{
alert("input your details")
return false;
}
else if(isNaN(paswd))
{
alert("only numbers")
return false;
}

mypaswd=123;

 if(mypaswd!=paswd)
{
alert("incorrect password !!! ")
return false;
}

document.write("name is "+name+ "<br/>");


}

</script>
</head>

<body>

<form name="form1" method="post" onsubmit="login_mag()">
user name <input type="text" name="name" value=""><br/>
password <input type="password" name="password" value=""><br/>
<input type="submit" name="submit" value="submit">
<input type="reset" name="reset" value="reset">

</form>

</body>
</html>