สงสัยอีกแล้วค่ะ....Warning: mysql_select_db(): supplied argument is not a valid MySQL-Link resource in

<?php
define("_LINPERPAGE",20);
define("_EXPIREDAY",365);
?>
<table width='100%' bgcolor='#6F6FCF'>
<tr valign='top'><td align='center'>
<font color='#FFFFFF'><b>เว็บบอรด์รวมกว๊นนักวิทยาศาสตร์ตัวน้อย</b></font>
</table>
<center>
<font color='#0000FF'>---พูดคุยแลกเปลี่ยนความคิด---</font>
</center>
<hr>
<?php
if ($_SESSION['ss_Status'] == "online") {
	?>
	<form enctype='multiparform-data' name='postForm' method='post' action='post.php'>
	<table align='center'>
	<tr><td><font color='#00AF00'><b>ฝากข้อความถึงพรรคพวก..</b></font>
	<tr><td><textarea name='cText' cols='80' row='8'></textarea> 
	<tr><td>ไฟล์แนบ...<input type='file' name='cAttachfile' size='54'>
	<tr><td align='center'>&gt;&gt;&gt;
	<input type='submit' name='btpost' value='ส่งข้อความ'>&lt;&lt;&lt;
	</table>
	</form>
	<?php
}else{
		?>
		<center>
<img src='./' border='0'>
<img src='./' border='0'>
</center>
<?php
	}
		?>
<hr>
<table width='100%' bgcolor='#AFAFAF'>
<tr valign='middle'> <td align='center'>
<font size='2' color='#FFFFFF'>กรุณาใช้คำที่สุภาพนะค่ะ</font>
</table>
<hr>
<?php
$cntresult = @mysql_query("SELECT COUNT(ID) AS RecCnt FROM data " . "WHERE ParentID=0 AND ((UNIX_TIMESTAMP()-" . "UNIX_TIMESTAMP(PostDataTime)) < " . (_EXPIREDAYS * 86400) . ")");
if ($cntrw= @mysql_fetch_array($cntreult)) {
	$mRecCnt = $cntrow["RecCnt"];
}
***$mPageCnt = ceil($mRecCnt / _LINEPERPAGE);

if (isset($_GET['pPageNo'])) {
	$mPageNo = $_GET['pPageNo'];
}else{
	$mPageNo = 1;
}
$mStarRec = $mRecCnt - (_LINEPERPAGE * $mPageNo) + 1;
$mEndRec = $mStarRec + _LINEPERPAGE - 1;
if ($mStarRec <= 0) $mStarRec = 1;
$textresult = @mysql_query("SELECT data., userprofile.NickName, " . "userprofile.FirstName FROM data INNER JOIN userprofile" . "ON data.UserID WHERE ParentID=0 AND " . "((UNIX_TIMESTAMP()- UNIX_TIMESTAMP(PostDataTime))<" . (_EXPIREDAYS * 86400) . ") ORDER BY data.ID DESC");
print "<table width='100%'>";
$cnt = $mRecCnt;
while ($textrow = @mysql_fetch_array($textresult) and $cnt >= $mStarRec) {
	if ($cnt >= $mStarRec and $cnt <=$mEndRec) {
		$mName = isset($textrow["NickName"]) ? $extrow["NickName"] : 
			(isset($textrow["FirtName"]) ? $textrow["FirtName"] : "");
		$mName = substr($mName, 0, 20);
		$appendresult = mysql_query("SELECT COUNT(ID) AS childNum FROM data " . "WHERE ParentID=" . $textrow["ID"]);
		if ($appendrow = mysql_fetch_array($appendresult)) {
			$mChildNum = isset($appendrow["ChildNum"]) ?
				$appendrow["ChildNum"] : 0;
		}else{
			$mChildNum = 0;
		}
		?>
		<tr valign='top'>";
		<td width='100'><b><img src='./' border='0'>&nbsp;
		<font size='2' color='#009F00'>
		<a href='showuserprofile.php?UserID=<?php echo$ $textrow["UserID"]; ?>'
		target='_profile'><?php echo $mName; ?></a></font></b><br>
		<font size='2' color='#AFAFAF'>
		<i><?php echo $textrow["PostDateTime"]; ?></i>
		</font><br><br>";
		<td>:
		<td><font size='2'>
		<?php
			if (($_SESSION['ss_Level'] == "admin") and $_SESSION['ss_ShowManage']) {
			print "<a href='delmsg.php'?pID=" . $textrow["ID"] . "'>"  . 
				"<img src='./' border='0' art='ลบข้อความ'></a>";
		}
		print (isset($textrow["text"]) ? ("<a href='showmsg.php?pID=" . $textrow["ID"] . "' target='_blak'>" . substr($textrow["Text"], 0, 254) . "</a>") : "");
		if (isset($textrow["Text"]) and strlen($textrow["Text"]) > 255) {
			print "&nbsp;&nbsp;<a href='showmsg.php?pID=" . $textrow["ID"] . "' target='_blak'><font color='#FF8F00'>" . "<b> มีต่อ...</b></font></a>";
		}
		if ($mChildNum > 0) {
			print "<b>&nbsp;&nbsp;($mChildNum)</b>";
		}
		if (isset($textrow["AttachFile"]) and $textrow["AttachFile"] != "") {
			print"&nbsp;&nbsp;&nbsp;<a hret='" . ("./attachfiles/" . $textrow["AttachFile"]) . "'><img src='./' " . "border='0' alt='ไฟล์แนบ : " . $textrow["AttachFile"] . "'></a>";
		}
		print "</font>";
		print "<tr><td>";
	}
	$cnt--;
}
?>
</table>
<table width='100%'>
<tr><td align='rigth'>หน้า....&nbsp;&nbsp;
<?php
for($i = 1; $i <= $mPageCnt; $i++) {
	if($i != $mpageNo) {
		print "<a href='main.php?pPageNo=$i'><b>$i</b></a>&nbsp;&nbsp;";
	}else{
		print"<b>$i</b>&nbsp;&nbsp;";
	}
}
?>
</table>