diff --git a/FlashWindow.cs b/FlashWindow.cs
new file mode 100644
index 0000000..0e8de45
--- /dev/null
+++ b/FlashWindow.cs
@@ -0,0 +1,136 @@
+using System.Runtime.InteropServices;
+using System;
+public static class FlashWindow
+{
+	[DllImport("user32.dll")]
+	[return: MarshalAs(UnmanagedType.Bool)]
+	private static extern bool FlashWindowEx(ref FLASHWINFO pwfi);
+	[StructLayout(LayoutKind.Sequential)]
+	private struct FLASHWINFO
+	{
+		/// <summary>
+		/// The size of the structure in bytes.
+		/// </summary>
+		public uint cbSize;
+		/// <summary>
+		/// A Handle to the Window to be Flashed. The window can be either opened or minimized.
+		/// </summary>
+		public IntPtr hwnd;
+		/// <summary>
+		/// The Flash Status.
+		/// </summary>
+		public uint dwFlags;
+		/// <summary>
+		/// The number of times to Flash the window.
+		/// </summary>
+		public uint uCount;
+		/// <summary>
+		/// The rate at which the Window is to be flashed, in milliseconds. If Zero, the function uses the default cursor blink rate.
+		/// </summary>
+		public uint dwTimeout;
+	}
+	/// <summary>
+	/// Stop flashing. The system restores the window to its original stae.
+	/// </summary>
+	public const uint FLASHW_STOP = 0;
+
+	/// <summary>
+	/// Flash the window caption.
+	/// </summary>
+	public const uint FLASHW_CAPTION = 1;
+
+	/// <summary>
+	/// Flash the taskbar button.
+	/// </summary>
+	public const uint FLASHW_TRAY = 2;
+
+	/// <summary>
+	/// Flash both the window caption and taskbar button.
+	/// This is equivalent to setting the FLASHW_CAPTION | FLASHW_TRAY flags.
+	/// </summary>
+	public const uint FLASHW_ALL = 3;
+	/// <summary>
+	/// Flash continuously, until the FLASHW_STOP flag is set.
+	/// </summary>
+	public const uint FLASHW_TIMER = 4;
+	/// <summary>
+	/// Flash continuously until the window comes to the foreground.
+	/// </summary>
+	public const uint FLASHW_TIMERNOFG = 12;
+
+	/// <summary>
+	/// Flash the spacified Window (Form) until it recieves focus.
+	/// </summary>
+	/// <param name="form">The Form (Window) to Flash.</param>
+	/// <returns></returns>
+	public static bool Flash(System.Windows.Forms.Form form)
+	{
+		// Make sure we're running under Windows 2000 or later
+		if(Win2000OrLater)
+		{
+			FLASHWINFO fi = Create_FLASHWINFO(form.Handle, FLASHW_ALL | FLASHW_TIMERNOFG, uint.MaxValue, 0);
+			return FlashWindowEx(ref fi);
+		}
+		return false;
+	}
+	private static FLASHWINFO Create_FLASHWINFO(IntPtr handle, uint flags, uint count, uint timeout)
+	{
+		FLASHWINFO fi = new FLASHWINFO();
+		fi.cbSize = Convert.ToUInt32(Marshal.SizeOf(fi));
+		fi.hwnd = handle;
+		fi.dwFlags = flags;
+		fi.uCount = count;
+		fi.dwTimeout = timeout;
+		return fi;
+	}
+	/// <summary>
+	/// Flash the specified Window (form) for the specified number of times
+	/// </summary>
+	/// <param name="form">The Form (Window) to Flash.</param>
+	/// <param name="count">The number of times to Flash.</param>
+	/// <returns></returns>
+	public static bool Flash(System.Windows.Forms.Form form, uint count)
+	{
+		if(Win2000OrLater)
+		{
+			FLASHWINFO fi = Create_FLASHWINFO(form.Handle, FLASHW_ALL, count, 0);
+			return FlashWindowEx(ref fi);
+		}
+		return false;
+	}
+	/// <summary>
+	/// Start Flashing the specified Window (form)
+	/// </summary>
+	/// <param name="form">The Form (Window) to Flash.</param>
+	/// <returns></returns>
+	public static bool Start(System.Windows.Forms.Form form)
+	{
+		if(Win2000OrLater)
+		{
+			FLASHWINFO fi = Create_FLASHWINFO(form.Handle, FLASHW_ALL, uint.MaxValue, 0);
+			return FlashWindowEx(ref fi);
+		}
+		return false;
+	}
+	/// <summary>
+	/// Stop Flashing the specified Window (form)
+	/// </summary>
+	/// <param name="form"></param>
+	/// <returns></returns>
+	public static bool Stop(System.Windows.Forms.Form form)
+	{
+		if(Win2000OrLater)
+		{
+			FLASHWINFO fi = Create_FLASHWINFO(form.Handle, FLASHW_STOP, uint.MaxValue, 0);
+			return FlashWindowEx(ref fi);
+		}
+		return false;
+	}
+	/// <summary>
+	/// A boolean value indicating whether the application is running on Windows 2000 or later.
+	/// </summary>
+	private static bool Win2000OrLater
+	{
+		get { return System.Environment.OSVersion.Version.Major >= 5; }
+	}
+}
\ No newline at end of file
diff --git a/Form1.cs b/Form1.cs
index 8fbf702..dc49c03 100644
--- a/Form1.cs
+++ b/Form1.cs
@@ -6,15 +6,17 @@ using System.Drawing;
 using System.Linq;
 using System.Text;
 using System.Windows.Forms;
+using System.Runtime.InteropServices;
 
 namespace WebChecker
 {
 	public partial class Form1 : Form
 	{
-		const int CHECK_PERIOD = 30000;
+		const int CHECK_PERIOD = 1000*30;
 
 		WebBrowser wb = new WebBrowser();
 		string url = "http://me.sayclub.com/profile/home/view/ban8";
+		//string url = "http://me.sayclub.com/profile/home/view/tosvmfks53";
 		Timer m_Timer = new Timer();
 
 		int m_iReqCnt = 0;
@@ -37,6 +39,16 @@ namespace WebChecker
 			wb.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(wb_DocumentCompleted);
 		}
 
+		void Alert(string message)
+		{
+			this.Show();
+			this.TopMost = true;
+			FlashWindow.Start(this);
+
+			MessageBox.Show(this, message);
+			FlashWindow.Stop(this);
+		}
+
 		void wb_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
 		{
 			if(e.Url.Host != wb.Url.Host)
@@ -61,7 +73,7 @@ namespace WebChecker
 				if(attr.IndexOf("login") >= 0)
 				{
 					Process.Checked = false;
-					MessageBox.Show("logged in");
+					Alert("logged in");
 				}
 
 				lbStatus.Text = "상태 : 체크 완료";
diff --git a/WebChecker.csproj b/WebChecker.csproj
index 7312817..fc71206 100644
--- a/WebChecker.csproj
+++ b/WebChecker.csproj
@@ -48,6 +48,8 @@
     <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="FlashWindow.cs">
+    </Compile>
     <Compile Include="Form1.cs">
       <SubType>Form</SubType>
     </Compile>