function check_form(login){ 
if (login.username.value == "User Name"){ 
alert("Please insert your User Name!"); 
login.name.focus(); 
return (false); 
} 
if (login.password.value == "Password"){ 
alert("Please insert your Password!"); 
login.password.focus(); 
return (false); 
}
return (true); 
}