ช่วยดูcode php ในส่วนการล็อกอินให้หน่อยคะ เขียนโคดถูกแร้วอ่ะคะ แต่ว่าพอกรอกข้อมูลถูกก้อขึ้นว่ารหัสและพาสเวิดผิดอ่ะคะ

$db_hostname='localhost'; //???? host
$db_username='root'; //???? user ???? db
$db_password='1030'; //???????????? db
$db_name="thaisatay"; //???? db ?????? create ???
mysql_connect($db_hostname,$db_username,$db_password) or die("Unable to Connect"); // ???????????????
mysql_select_db( $db_name ); //????? database

$username = $_POST["user"];
$password = $_POST["pass"];

$sql = "select * from admin where useradmin = '$username'and passwordadmin = '$password'";
$result = mysql_query($sql);

if(mysql_num_rows($result) > 0)
{
$rows = mysql_fetch_array($result);
$_SESSION["useradmin"] = $rows["useradmin"];
echo "already login ";
}
else
{
echo "wrong";
}

$db_hostname='localhost'; //???? host
$db_username='root'; //???? user ???? db
$db_password='1030'; //???????????? db
$db_name="thaisatay"; //???? db ?????? create ???
mysql_connect($db_hostname,$db_username,$db_password) or die("Unable to Connect"); // ???????????????
mysql_select_db( $db_name ); //????? database

$username = $_POST["user"];
$password = $_POST["pass"];

echo $sql = "select * from admin where useradmin = '$username'and passwordadmin = '$password'";
$result = mysql_query($sql) or die(mysql_error()."<br />" . $sql);

if(mysql_num_rows($result) > 0)
{
$rows = mysql_fetch_array($result);
$_SESSION["useradmin"] = $rows["useradmin"];
echo "already login ";
}
else
{
echo "wrong";
}

เอา output มาแปะดูหน่อย

<?php
session_start();
if(isset($_SESSION["useradmin"]))
{
echo "User now".$_SESSION["useradmin"]."<br/>";
echo "<a href=\"logout.php\">Log out</a> ";
}
?>
<form action="" method="post" name="frm">
<table width="250" border="0" cellspacing="0" cellpadding="0">
<tr>
<td width="131">UserName</td>
<td width="169"><input name="user" type="text" id="user"></td>
</tr>
<tr>
<td>Password</td>
<td><input name="pass" type="password" id="pass"></td>
</tr>
<tr>
<td align="right"><input name="R" type="radio" value="0">
Admin
<input name="R" type="radio" value="1">
User</td>
<td><input type="submit" name="Submit" value="Login"></td>
</tr>
</table>

</form>
<?php

If($R=='0')
{
echo"<meta http-equiv=refresh content=1;URL=/ProjectPHP/checkadminlogin.php>"; //ไปที่ส่วนของผู้ดูแลระบบ
}
else if($R=='1')
{
echo"<meta http-equiv=refresh content=1;URL=/ProjectPHP/checkuserlogin.php>"; //ไปที่ส่วนของผู้ใช้งานระบบทั่วไป
}

?>

$db_hostname='localhost'; //???? host
$db_username='root'; //???? user ???? db
$db_password='1030'; //???????????? db
$db_name="thaisatay"; //???? db ?????? create ???
mysql_connect($db_hostname,$db_username,$db_password) or die("Unable to Connect"); // ???????????????
mysql_select_db( $db_name ); //????? database

$username = $_POST["user"];
$password = $_POST["pass"];
$r= $_POST["R"];

if($r == ){
echo $sql = "select useradmin as uname  from admin where useradmin = '$username' and passwordadmin = '$password'";
}else{
echo $sql = "select user as uname  from user where user = '$username' and password  = '$password'"; // ตรงนี้เปลี่ยนเอานะ
}
$result = mysql_query($sql) or die(mysql_error()."<br />" . $sql);

if(mysql_num_rows($result) > 0)
{
$rows = mysql_fetch_array($result);
$_SESSION["uname"] = $rows["uname"];
echo "already login ";
}
else
{
echo "wrong";
}

$db_hostname='localhost'; //???? host
$db_username='root'; //???? user ???? db
$db_password='1030'; //???????????? db
$db_name="thaisatay"; //???? db ?????? create ???
mysql_connect($db_hostname,$db_username,$db_password) or die("Unable to Connect"); // ???????????????
mysql_select_db( $db_name ); //????? database

$username = $_POST["user"];
$password = $_POST["pass"];
$r= $_POST["R"];

if($r == "0"){
echo $sql = "select useradmin as uname  from admin where useradmin = '$username' and passwordadmin = '$password'";
}else{
echo $sql = "select user as uname  from user where user = '$username' and password  = '$password'"; // ตรงนี้เปลี่ยนเอานะ
}
$result = mysql_query($sql) or die(mysql_error()."<br />" . $sql);

if(mysql_num_rows($result) > 0)
{
$rows = mysql_fetch_array($result);
$_SESSION["uname"] = $rows["uname"];
echo "already login ";
}
else
{
echo "wrong";
}