Saya lagi buat forum, standart forum pakek php & beberapa javascript.
cuma kepentok di finishing registernye gan.
nih register.php ane.

[removed] 

function isEmpty(field) {

return trim(field.value).length == 0;

}



function trim(str) {

return str.replace(/^\s*([\S\s]*?)\s*$/, '$1');

}



function validateAForm() {

var form = document.form1;

var username = form.username;

var pass= form.pass;

var email = form.email;

var email2 = form.email2;

if(isEmpty(username)) {

alert("Field UserNama Tidak Boleh Kosong");

username.focus();

return false; //mencegah form disubmit

}

if(isEmpty(pass)) {

alert("Field Password Tidak Boleh Kosong.");

pass.focus();

return false; //mencegah form disubmit

}

if(isEmpty(email)) {

alert("Field E-mail Tidak Boleh Kosong");

email.focus();

return false; //mencegah form disubmit

}

if(email2 != email) {

alert("Field Confirm E-mail tidak sama dengan E-mail.");

email2.focus();

return false; //mencegah form disubmit

}

return true; //teruskan submit

}

[removed]

<style type="text/css">

<!--

.style1 { color: #FFFFFF;

font-weight: bold;

}

-->

</style>

<form name="form1" method="post" action="proses_register.php">

<table width="83%" border="0" cellpadding="0" cellspacing="2">

<tr>

<td colspan="3"><span class="style1"><font color="#0066CC">REGISTER ID</font></span></td>

</tr>

<tr>

<td width="18%">�</td>

<td width="1%">�</td>

<td width="81%">�</td>

</tr>

<tr>

<td>User Name </td>

<td>�</td>

<td><input name="username" type="text" id="username" size="20" maxlength="20" />

<em>ID anda gunakan saat Login </em></td>

</tr>

<tr>

<td>Password</td>

<td>�</td>

<td><input name="pass" type="password" id="pass" size="15" maxlength="15" /></td>

</tr>

<tr>

<td>E-mail</td>

<td>�</td>

<td><input name="email" type="text" id="email" size="25" /></td>

</tr>

<tr>

<td>Confirm E-mail</td>

<td>�</td>

<td><p>

<input name="email2" type="text" id="email2" size="25" />

<br />

</p></td>

</tr>

<tr>

<td>NIM</td>

<td>�</td>

<td><input name="nim" type="text" id="nim" size="10" maxlength="10" /></td>

</tr>

<tr>

<td>Tahun Ajaran</td>

<td>�</td>

<td><label for="tahunajaran"></label>

<select name="tahunajaran" id="tahunajaran">

<?php

for($a=2000; $a<=2013; $a+=1){

echo"<option value=$a> $a </option>";

}

?>

</select></td>

</tr>

<tr>

<td>Tanggal Lahir</td>

<td>�</td>

<td>

<select name="tanggal" id="tanggal">

<?php

for($b=01; $b<=31; $b+=1){

echo"<option value=$b> $b </option>";

}

?>

</select>

<label for="bulan"></label>

<select name="bulan" id="bulan">

<?php

$bulan=array("Januari","Februari","Maret","April","Mei","Juni","Juli","Agustus","September","Oktober","November","Desember");

$jlh_bln=count($bulan);

for($c=0; $c<$jlh_bln; $c+=1){

echo"<option value=$bulan[$c]> $bulan[$c] </option>";

}

?>

</select>

<label for="tahun"></label>

<select name="tahun" id="tahun">

<?php

for($d=2000; $d>=1980; $d-=1){

echo"<option value=$d> $d </option>";

}

?>

</select></td>

</tr>

<tr>

<td>Jenis</td>

<td>�</td>

<td>

<input type="radio" name="gender" id="gender" value="L" checked="checked" />

Laki-Laki

<input type="radio" name="gender" id="gender" value="P" />

Perempun</td>

</tr>

<tr>

<td colspan="3"><p><font size="-1" color="#0066CC">REGISTER CONFIRMATION!<br>

</font><font size="-1">Untuk mencegah adanya auto register, mohon masukkan code yang terlihat dibawah!</font></p></td>

</tr>

<tr>

<td colspan="3"><p>

<img src="captcha.php" />

<br />

<input name="captcha" type="text" size="10" maxlength="6" />

<br />

</p>

<p>�</p></td>

</tr>

<tr>

<td>

<input type="submit" name="Submit" value="Save" />

<input name="Batal" type="reset" id="Batal" value="Batal" /></td>

<td>�</td>

<td>�</td>

</tr>

</table>

</form>

Ane maunya begini gan
1. Maunya waktu ane input username di username textfield, ntar bakal langsung ada loading search apa usernamenya udah ada / belom didatabase. kira2 kayak di register2 web / forum laen lah tanpa perlu buka page baru.
ane coba gabungin di javascript atas eh malah loop notifnya.

2. ane kan buat captcha, fungsi sih tapi ceknya lewat proses_register.php, maksudnya butuh buka page baru biar tau apa captchnya bener / nggak. nah ane pengennya pas pencet submit, langsung di cek tuh captcha sebelum masuk ke proses_register.php. kalau misalnya salah gak bakal lanjut (muncul pesan error kalau captchanya salah kyk javascript ane yg buat anti field kosong diatas.

mohon bantuannye buat agan-agan masta php & java, ane bingung seharian kagak kelar nyarinye