Modul WEB Java Script 2

?html>
?head>
?title>Mencoba Validasi XXX?/title>
?/head>
?body>
?form name = "Mahasiswa" method ="GET" >
?script language = "JavaScript">
?!--

function periksa() {
if (document.Mahasiswa.textNPM.value == '" "' ){
alert ("NPM Jangan Kosong \n" + "Karena Bukan Null Value");
Mahasiswa.textNPM.focus();
return;
}
else

window.location.href = "Ftest.html";

}
document.write(" ?pre>NPM : ?input type = 'text' size = '14' name = 'textNPM'> ?/pre>");
document.write(" ?pre>Nama : ?input type = 'text' size = '20' name = 'textNama'>?/pre>");
document.write(" ?pre>NPM : ?input type = 'text' size = '35' name = 'textAlamat'> ?/pre>");
//-->

?/script>

?input type = "button" name = "btnsimpan" value = "Simpan" onClick = "periksa()">

?/form>

?/body>

?/html>