php mysql ช่วยดูทีครับ กรอกแล้วไม่ insert ลงฐานข้อมูล

<form id="form1" name="form1" method="post" action="test.php">
  <label>
 <center>
   <p>Username
     
     <input name="txtuser" type="text" id="txtuser" />
   </p>
  </center>
  </label>
  
  
    <label>
    <center>
      <p>Password
       
        <input name="txtpass" type="password" id="txtpass" />
      </p>
    </center>
  </label>
 
   <center>
   <center>
     Email&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
     
  <input name="txtmail" type="text" id="txtmail" /></center>
        
       <center> <input type="submit" name="Submit" value="Submit" /> </center>
     
</form>





  

<?
	mysql_connect ("mysql10.000webhost.com" , "a8117359_test" , "boss123456");
	mysql_select_db ("a8117359_test");
	
	if(trim($_POST["txtuser"]) == "")
	{
		echo "<script> alert ('โปรดกรอก User') </script>";
		exit();
	}
	if(trim($_POST["txtpass"]) == "")
	{
		echo "<script> alert ('โปรดกรอก Password') </script>";
		exit();
	}
	if(trim($_POST["txtmail"]) == "")
	{
		echo "<script> alert ('โปรดกรอก Email')</script>";
		exit();
	}
	
	$strSQL = "SELECT * FROM member WHERE User = ' ".trim($_POST['txtuser'])."' ";
	$objQuery =  mysql_query($strSQL) or (mysql_error());
	$objResult = mysql_fetch_array($objQuery);
	if($objResult)
	{
		echo "<script> alert ('มีคนใช้ User นี้แล้ว') </script>";
	}
	else
	{
		$strSQL= "INSERT INTO member (User,Pass,Email) VALUES ('" .$_POST["txtuser"]."', '".$_POST["txtpass"]."','".$_POST["txtmail"]."')" or die (mysql_error($strSQl));
	$objQuery = mysql_query($strSQl);
	
	echo "สมัครสมาชิกเรียบร้อย";
	
	echo "Go to <a href='index.php'> Home page</a>";
	}
	mysql_close();
?>