อยากให้ มี popup เด้งเเสดงเเจ้งเตือนมาตามวันที่มีข้อมูลจาก DB อะครับ ตอน login

$chkWork=mysql_query("SELECT * FROM TB_WORK WHERE DATE_WORK=CURDATE() AND user='$user'");
$rs=mysql_fetch_array($chkWork);
if(!empty($rs['WORK'])){
  echo "<script>alert(มีงาน)</script>";
}else{
  echo "";
}

session_start();
$user=$_SESSION["UserID"]
$chkWork=mysql_query("SELECT * FROM TB_WORK WHERE DATE_WORK=CURDATE() AND user='$user'");
$rs=mysql_fetch_array($chkWork);
if(!empty($rs['WORK'])){
  echo "<script>alert(มีงาน)</script>";
}else{
  echo "";
}

<?
	@session_start();
	mysql_connect("localhost","root","1234");
	mysql_select_db("mydatabase");
	$strSQL = "SELECT * FROM tb_member WHERE Username = '".mysql_real_escape_string($_POST['txtUsername'])."' 
	and Password = '".mysql_real_escape_string($_POST['txtPassword'])."'";
	$objQuery = mysql_query($strSQL);
	$objResult = mysql_fetch_array($objQuery);
	if(!$objResult)
	{
			echo "<script>alert('Username and Password Incorrect!');
					window.location='Login.php'; 
					</script>";
	}
	else
	{	
			$_SESSION["UserID"] = $objResult["UserID"];
			$_SESSION["Username"] = $objResult["Username"];
			$_SESSION["Status"] = $objResult["Status"];

			session_write_close();
			
			if($objResult["Status"] == "ADMIN")
			{
				$chkWork=mysql_query("SELECT * FROM tb_meet WHERE event_start = CURDATE() AND user='$user'");
				$rs=mysql_fetch_array($chkWork);
				if(!empty($rs['WORK'])){
  					echo "<script>alert('SSSSSS')</script>";
				}else{
  					echo "";
				}
				header("location:admin_page.php");
			}
			else
			{
				header("location:user_page.php");
			}
	}
	mysql_close();
?>