Simpelt login-script virker ikke i Firefox 1.0

Bruger dette simple login-script, og det virker i IE men ikke i Firefox:

function PasswordLogin()
{
    location.href = formlogin.password.value + ".php";
    return false;
}
function CheckEnter(event)
{
    var NS4 = (document.layers) ? true : false;
    var code = 0;
    if (NS4)
        code = event.which;
    else
        code = event.keyCode;
    if (code==13)
    {
        PasswordLogin();
        event.returnValue = false;
    }
} 

Selve formen:

<form name="formlogin" action="" onsubmit="PasswordLogin()"
<input type="password" name="password" size="20" onKeyPress="CheckEnter(event)">
<input name="button" type="button" onClick="PasswordLogin()" value="Login">
</form>

Firefox skriver i sin JavaScript-konsol at "formlogin is not defined". Hvad er der galt?

Mvh.