Connect database จาก SQL Server ไม่ได้ค่ะ Warning: mssql_connect() [function.mssql-connect]: Unable to connect to server: localhost in

<?
$objConnect = mssql_connect("localhost","sa","") or die("Error Connect to Database");
$objDB = mssql_select_db("csmiledbdem");
$strSQL = "SELECT * FROM cschequein ORDER BY CHEQUENO ASC";
$objQuery = mssql_query($strSQL) or die ("Error Query [".$strSQL."]");
$Num_Rows = mssql_num_rows($objQuery);

$Per_Page = 50;   // Per Page

$Page = $_GET["Page"];
if(!$_GET["Page"])
{
	$Page=1;
}

$Prev_Page = $Page-1;
$Next_Page = $Page+1;

$Page_Start = (($Per_Page*$Page)-$Per_Page);
if($Num_Rows<=$Per_Page)
{
	$Num_Pages =1;
}
else if(($Num_Rows % $Per_Page)==0)
{
	$Num_Pages =($Num_Rows/$Per_Page) ;
}
else
{
	$Num_Pages =($Num_Rows/$Per_Page)+1;
	$Num_Pages = (int)$Num_Pages;
}
$Page_End = $Per_Page * $Page;
IF ($Page_End > $Num_Rows)
{
	$Page_End = $Num_Rows;
}

?>
<table width="600" border="1">
  <tr>
    <th width="91"> <div align="center">CustomerID </div></th>
   
  </tr>
<?
for($i=$Page_Start;$i<$Page_End;$i++)
{
?>
  <tr>
    <td><div align="center"><?=mssql_result($objQuery,$i,"CHEQUENO");?></div></td>
    
  </tr>
<?
}
?>
</table>

<br>
Total <?= $Num_Rows;?> Record : <?=$Num_Pages;?> Page :
<?
if($Prev_Page)
{
	echo " <a href='$_SERVER[SCRIPT_NAME]?Page=$Prev_Page'><< Back</a> ";
}

for($i=1; $i<=$Num_Pages; $i++){
	if($i != $Page)
	{
		echo "[ <a href='$_SERVER[SCRIPT_NAME]?Page=$i'>$i</a> ]";
	}
	else
	{
		echo "<b> $i </b>";
	}
}
if($Page!=$Num_Pages)
{
	echo " <a href ='$_SERVER[SCRIPT_NAME]?Page=$Next_Page'>Next>></a> ";
}


mssql_close($objConnect);
?>

<?
$objConnect = mssql_connect("192.168.88.4","sa","114487") or die("Error Connect to Database");
$objDB = mssql_select_db("csmiledbdem");
$strSQL = "SELECT * FROM cschequein ORDER BY CHEQUENO ASC";
$objQuery = mssql_query($strSQL) or die ("Error Query [".$strSQL."]");