Index: src/ch/UpdateChecker.cpp
===================================================================
diff -u -N
--- src/ch/UpdateChecker.cpp	(revision 0)
+++ src/ch/UpdateChecker.cpp	(revision a3019fc815b1cf8697777e432338a3b8eb0cb820)
@@ -0,0 +1,60 @@
+#include "stdafx.h"
+#include "UpdateChecker.h"
+#include <afxinet.h>
+#include <atlconv.h>
+#include "../common/version.h"
+
+CUpdateChecker::ECheckResult CUpdateChecker::CheckForUpdates(bool bCheckBeta)
+{
+	try
+	{
+		CInternetSession inetSession;
+		CHttpConnection* pHttpConnection = inetSession.GetHttpConnection(_T("www.copyhandler.com"), INTERNET_FLAG_RELOAD | INTERNET_FLAG_DONT_CACHE, 80);
+		if(!pHttpConnection)
+			return eResult_Error;
+
+		CString strAddr = _T("chver.php?ver=");
+		strAddr += bCheckBeta ? _T("beta") : _T("stable");
+		CHttpFile* pHttpFile = pHttpConnection->OpenRequest(CHttpConnection::HTTP_VERB_GET, strAddr);
+		if(!pHttpFile)
+			return eResult_Error;
+
+		if(!pHttpFile->SendRequest())
+			return eResult_Error;
+
+		char szBuf[256];
+		UINT uiRD = pHttpFile->Read(szBuf, 255);
+		if(uiRD > 0)
+			szBuf[uiRD] = _T('\0');
+
+		// convert text to unicode
+		CA2CT a2ct(szBuf);
+
+		// and compare to current version
+		ushort_t usVer[4];
+		if(_stscanf(a2ct, _t("%hu.%hu.%hu.%hu"), &usVer[0], &usVer[1], &usVer[2], &usVer[3]) != 4)
+		{
+			TRACE(_T("Error parsing retrieved version number."));
+			return eResult_Error;
+		}
+
+		ull_t ullCurrentVersion = ((ull_t)PRODUCT_VERSION1) << 48 | ((ull_t)PRODUCT_VERSION2) << 32 | ((ull_t)PRODUCT_VERSION3) << 16 | ((ull_t)PRODUCT_VERSION4);
+		ull_t ullSiteVersion = ((ull_t)usVer[0]) << 48 | ((ull_t)usVer[1]) << 32 | ((ull_t)usVer[2]) << 16 | ((ull_t)usVer[3]);
+
+		if(ullCurrentVersion < ullSiteVersion)
+			return eResult_VersionOlder;
+		else if(ullCurrentVersion == ullSiteVersion)
+			return eResult_VersionCurrent;
+		else
+			return eResult_VersionNewer;
+	}
+	catch(CInternetException* e)
+	{
+		TCHAR* pszBuffer = m_strLastError.GetBufferSetLength(1024);
+		e->GetErrorMessage(pszBuffer, 1023);
+		pszBuffer[1023] = _T('\0');
+		m_strLastError.ReleaseBuffer();
+
+		return eResult_Error;
+	}
+}
Index: src/ch/UpdateChecker.h
===================================================================
diff -u -N
--- src/ch/UpdateChecker.h	(revision 0)
+++ src/ch/UpdateChecker.h	(revision a3019fc815b1cf8697777e432338a3b8eb0cb820)
@@ -0,0 +1,25 @@
+#ifndef __UPDATECHECKER_H__
+#define __UPDATECHECKER_H__
+
+class CUpdateChecker
+{
+public:
+	enum ECheckResult
+	{
+		eResult_VersionOlder,
+		eResult_VersionCurrent,
+		eResult_VersionNewer,
+		eResult_Error
+	};
+public:
+	CUpdateChecker() { };
+	~CUpdateChecker() { };
+
+	ECheckResult CheckForUpdates(bool bCheckBeta);
+	const tchar_t* GetLastError() const { return (const tchar_t*)m_strLastError; }
+
+protected:
+	CString m_strLastError;
+};
+
+#endif
Index: src/ch/ch.vc90.vcproj
===================================================================
diff -u -N -r8bf223e9f8ab564d95bef4eb4f64a9c6628f62f9 -ra3019fc815b1cf8697777e432338a3b8eb0cb820
--- src/ch/ch.vc90.vcproj	(.../ch.vc90.vcproj)	(revision 8bf223e9f8ab564d95bef4eb4f64a9c6628f62f9)
+++ src/ch/ch.vc90.vcproj	(.../ch.vc90.vcproj)	(revision a3019fc815b1cf8697777e432338a3b8eb0cb820)
@@ -711,6 +711,10 @@
 				RelativePath="TrayIcon.cpp"
 				>
 			</File>
+			<File
+				RelativePath=".\UpdateChecker.cpp"
+				>
+			</File>
 		</Filter>
 		<Filter
 			Name="Header Files"
@@ -992,6 +996,10 @@
 				RelativePath="TrayIcon.h"
 				>
 			</File>
+			<File
+				RelativePath=".\UpdateChecker.h"
+				>
+			</File>
 		</Filter>
 		<Filter
 			Name="Resource Files"