diff --git a/src/otrlchatinterface.cpp b/src/otrlchatinterface.cpp
index 70103a0..41fd427 100644
--- a/src/otrlchatinterface.cpp
+++ b/src/otrlchatinterface.cpp
@@ -96,7 +96,7 @@ static void create_privkey(void *opdata, const char *accountname, const char *pr
 
 	Kopete::ChatSession *session= ((Kopete::ChatSession*)opdata);
 
-	PrivKeyPopup *popup = new PrivKeyPopup( session->view()->mainWidget(), i18n("Generating private key"),  TQt::WType_Dialog | TQt::WStyle_StaysOnTop );
+	PrivKeyPopup *popup = new PrivKeyPopup( session->view()->mainWidget(), i18n("Generating private key").utf8(), TQt::WType_Dialog | TQt::WStyle_StaysOnTop );
 	KAnimWidget *anim = new KAnimWidget( "kde", 72, popup->animFrame, "kopete" );
 	anim->start();
 	anim->show();
@@ -192,7 +192,7 @@ static void new_fingerprint(void *opdata, OtrlUserState us, const char *accountn
 
 static void write_fingerprints(void *opdata){
 	kdDebug() << "Writing fingerprints" << endl;
-	otrl_privkey_write_fingerprints( userstate, TQString(TDEGlobal::dirs()->saveLocation("data", "kopete_otr/", true )) + "fingerprints" );
+	otrl_privkey_write_fingerprints( userstate, TQString("%1%2").arg(TDEGlobal::dirs()->saveLocation("data", "kopete_otr/", true )).arg("fingerprints").local8Bit() );
 }
 
 static void gone_secure(void *opdata, ConnContext *context){
@@ -340,7 +340,7 @@ void handle_smp_event(void *opdata, OtrlSMPEvent smp_event, ConnContext *context
 		case OTRL_SMPEVENT_NONE:
 			break;
 		case OTRL_SMPEVENT_ASK_FOR_SECRET: {
-			SMPPopup *popup = new SMPPopup( chatSession->view()->mainWidget(), i18n("Enter authentication secret"), TQString::null, TQt::WType_Dialog | TQt::WStyle_StaysOnTop, context, chatSession, false );
+			SMPPopup *popup = new SMPPopup( chatSession->view()->mainWidget(), i18n("Enter authentication secret").utf8(), TQString::null, TQt::WType_Dialog | TQt::WStyle_StaysOnTop, context, chatSession, false );
 			popup->show();
 			break;
 		}
@@ -487,7 +487,7 @@ void handle_msg_event(void *opdata, OtrlMessageEvent msg_event, ConnContext *con
 void create_instag(void *opdata, const char *accountname, const char *protocol){
 	Q_UNUSED(opdata)
 
-	otrl_instag_generate(OtrlChatInterface::self()->getUserstate(), TQString(TDEGlobal::dirs()->saveLocation("data", "kopete_otr/", true )) + "instags", accountname, protocol);
+	otrl_instag_generate(OtrlChatInterface::self()->getUserstate(), TQString("%1%2").arg(TDEGlobal::dirs()->saveLocation("data", "kopete_otr/", true )).arg("instags").local8Bit(), accountname, protocol);
 }
 #endif // HAVE_LIBOTR_0400
 
@@ -576,12 +576,12 @@ OtrlChatInterface::OtrlChatInterface(){
 
 	userstate = otrl_userstate_create();
 
-	otrl_privkey_read( userstate, TQString(TDEGlobal::dirs()->saveLocation("data", "kopete_otr/", true )) + "privkeys" );
+	otrl_privkey_read( userstate, TQString("%1%2").arg(TDEGlobal::dirs()->saveLocation("data", "kopete_otr/", true )).arg("privkeys").local8Bit() );
 
-	otrl_privkey_read_fingerprints(userstate, TQString(TDEGlobal::dirs()->saveLocation("data", "kopete_otr/", true )) + "fingerprints", NULL, NULL);
+	otrl_privkey_read_fingerprints(userstate, TQString("%1%2").arg(TDEGlobal::dirs()->saveLocation("data", "kopete_otr/", true )).arg("fingerprints").local8Bit(), NULL, NULL);
 
 #ifdef HAVE_LIBOTR_0400
-	otrl_instag_read(userstate, TQString(TDEGlobal::dirs()->saveLocation("data", "kopete_otr/", true )) + "instags");
+	otrl_instag_read(userstate, TQString("%1%2").arg(TDEGlobal::dirs()->saveLocation("data", "kopete_otr/", true )).arg("instags").local8Bit());
 
 	unsigned int interval = otrl_message_poll_get_default_interval(userstate);
 	forwardSecrecyTimerStart(interval);
@@ -661,7 +661,7 @@ int OtrlChatInterface::decryptMessage( TQString *msg, TQString accountId,
 			if (nextMsg != OTRL_SMP_EXPECT1){
 				abortSMP( context, chatSession );
 			} else {
-				SMPPopup *popup = new SMPPopup( chatSession->view()->mainWidget(), i18n("Enter authentication secret"), TQString::null, TQt::WType_Dialog | TQt::WStyle_StaysOnTop, context, chatSession, false );
+				SMPPopup *popup = new SMPPopup( chatSession->view()->mainWidget(), i18n("Enter authentication secret").utf8(), TQString::null, TQt::WType_Dialog | TQt::WStyle_StaysOnTop, context, chatSession, false );
 				popup->show();
 			}
 		}
@@ -736,7 +736,7 @@ TQString OtrlChatInterface::encryptMessage( TQString msg, TQString accountId,
 	TQString protocol, TQString contactId , Kopete::ChatSession *chatSession ){
 	int err;
 	char * newMessage;
-	if( otrl_proto_message_type( msg ) == OTRL_MSGTYPE_NOTOTR ){
+	if( otrl_proto_message_type( msg.latin1() ) == OTRL_MSGTYPE_NOTOTR ){
 		msg.replace( TQString("<"), TQString("&lt;"), false );
 #ifdef HAVE_LIBOTR_0400
 		otrl_instag_t instance = chatSession->property("otr-instag").toUInt();
@@ -754,7 +754,7 @@ TQString OtrlChatInterface::encryptMessage( TQString msg, TQString accountId,
 			}
 		}
 	}
-	OtrlMessageType type = otrl_proto_message_type( msg );
+	OtrlMessageType type = otrl_proto_message_type( msg.latin1() );
 	if( type == OTRL_MSGTYPE_NOTOTR | type == OTRL_MSGTYPE_TAGGEDPLAINTEXT ){
 		msg.replace( "&lt;", "<", false );		
 	}
@@ -772,9 +772,9 @@ TQString OtrlChatInterface::getDefaultQuery( TQString accountId ){
 void OtrlChatInterface::disconnectSession( Kopete::ChatSession *chatSession ){
 #ifdef HAVE_LIBOTR_0400
 	otrl_instag_t instance = chatSession->property("otr-instag").toUInt();
-	otrl_message_disconnect( userstate, &ui_ops, chatSession, chatSession->account()->accountId().latin1(), chatSession->account()->protocol()->displayName().latin1(), chatSession->members().getFirst()->contactId(), instance );
+	otrl_message_disconnect( userstate, &ui_ops, chatSession, chatSession->account()->accountId().latin1(), chatSession->account()->protocol()->displayName().latin1(), chatSession->members().getFirst()->contactId().latin1(), instance );
 #else // HAVE_LIBOTR_0400
-	otrl_message_disconnect( userstate, &ui_ops, chatSession, chatSession->account()->accountId().latin1(), chatSession->account()->protocol()->displayName().latin1(), chatSession->members().getFirst()->contactId() );
+	otrl_message_disconnect( userstate, &ui_ops, chatSession, chatSession->account()->accountId().latin1(), chatSession->account()->protocol()->displayName().latin1(), chatSession->members().getFirst()->contactId().latin1() );
 #endif // HAVE_LIBOTR_0400
 	OTRPlugin::plugin()->emitGoneSecure( chatSession, false );
 
@@ -810,9 +810,9 @@ int OtrlChatInterface::privState( Kopete::ChatSession *session ){
 
 #ifdef HAVE_LIBOTR_0400
 	otrl_instag_t instance = session->property("otr-instag").toUInt();	
-	context = otrl_context_find(userstate, session->members().getFirst()->contactId(), session->account()->accountId(), session->account()->protocol()->displayName(), instance, 0, NULL, NULL, NULL);
+	context = otrl_context_find(userstate, session->members().getFirst()->contactId().latin1(), session->account()->accountId().latin1(), session->account()->protocol()->displayName().latin1(), instance, 0, NULL, NULL, NULL);
 #else // HAVE_LIBOTR_0400
-	context = otrl_context_find(userstate, session->members().getFirst()->contactId(), session->account()->accountId(), session->account()->protocol()->displayName(), 0, NULL, NULL, NULL);
+	context = otrl_context_find(userstate, session->members().getFirst()->contactId().latin1(), session->account()->accountId().latin1(), session->account()->protocol()->displayName().latin1(), 0, NULL, NULL, NULL);
 #endif // HAVE_LIBOTR_0400
 
 	if( context ){
@@ -853,7 +853,7 @@ void OtrlChatInterface::verifyFingerprint( Kopete::ChatSession *session ){
 	context = otrl_context_find( userstate, session->members().getFirst()->contactId().latin1(), session->account()->accountId().latin1(), session->protocol()->displayName().latin1(), 0, NULL, NULL, NULL);
 #endif // HAVE_LIBOTR_0400
 
-	SMPPopup *popup = new SMPPopup( session->view()->mainWidget(), i18n("Enter authentication secret"), TQString::null, TQt::WType_Dialog | TQt::WStyle_StaysOnTop, context, session, true );
+	SMPPopup *popup = new SMPPopup( session->view()->mainWidget(), i18n("Enter authentication secret").utf8(), TQString::null, TQt::WType_Dialog | TQt::WStyle_StaysOnTop, context, session, true );
 	popup->show();
 }
 
@@ -868,7 +868,7 @@ void OtrlChatInterface::setTrust( Kopete::ChatSession *session, bool trust ){
 			otrl_context_set_trust( fingerprint, NULL );
 		}
 		kdDebug() << "Writing fingerprints" << endl;
-		otrl_privkey_write_fingerprints( userstate, TQString(TDEGlobal::dirs()->saveLocation("data", "kopete_otr/", true )) + "fingerprints" );
+		otrl_privkey_write_fingerprints( userstate, TQString("%1%2").arg(TDEGlobal::dirs()->saveLocation("data", "kopete_otr/", true )).arg("fingerprints").local8Bit() );
 		OTRPlugin::plugin()->emitGoneSecure( session, privState( session ) );
 	} else {
 		kdDebug() << "could not find fingerprint" << endl;
@@ -880,7 +880,8 @@ Fingerprint *OtrlChatInterface::findFingerprint( TQString account ){
 
 	for( context = userstate->context_root; context != NULL; context = context->next ){
 		kdDebug() << context->username << endl;
-		if( strcmp( context->username, account ) == 0 ){
+		if (context->username == account)
+		{
 			kdDebug() << "found Context" << endl;
 			return context->active_fingerprint ? context->active_fingerprint : NULL;
 		}
@@ -894,7 +895,8 @@ TQString OtrlChatInterface::findActiveFingerprint( Kopete::ChatSession *session
 
 	for( context = userstate->context_root; context != NULL; context = context->next ){
 		kdDebug() << context->username << endl;
-		if( strcmp( context->username, session->members().getFirst()->contactId() ) == 0 ){
+		if (context->username == session->members().getFirst()->contactId())
+		{
 //			otrl_privkey_hash_to_human( hash, context->fingerprint_root.next->fingerprint );
 			otrl_privkey_hash_to_human( hash, context->active_fingerprint->fingerprint );
 			return hash;
@@ -940,13 +942,13 @@ void OtrlChatInterface::updateKeyfile( Kopete::Account *account ){
 	keyfile.writeBlock( file.latin1(), file.length() );
 	keyfile.close();
 	otrl_privkey_forget_all( userstate );
-	otrl_privkey_read( userstate, TQString(TDEGlobal::dirs()->saveLocation("data", "kopete_otr/", true )) + "privkeys" );
+	otrl_privkey_read( userstate, TQString("%1%2").arg(TDEGlobal::dirs()->saveLocation("data", "kopete_otr/", true )).arg("privkeys").local8Bit() );
 
 	file = "";
 	line = "";
 // Updating fingerprints from <=0.3
 	kdDebug() << "updating fingerprints" << endl;
-	TQFile fingerprintfile( TQString(TDEGlobal::dirs()->saveLocation("data", "kopete_otr/", true )) + "fingerprints" );
+	TQFile fingerprintfile( TQString("%1%2").arg(TDEGlobal::dirs()->saveLocation("data", "kopete_otr/", true )).arg("fingerprints").local8Bit() );
 
 	if( fingerprintfile.open( IO_ReadWrite ) ){
 		kdDebug() << "file open" << endl;
@@ -964,7 +966,7 @@ void OtrlChatInterface::updateKeyfile( Kopete::Account *account ){
 	fingerprintfile.writeBlock( file.latin1(), file.length() );
 	fingerprintfile.close();
 	otrl_context_forget_all( userstate );
-	otrl_privkey_read_fingerprints(userstate, TQString(TDEGlobal::dirs()->saveLocation("data", "kopete_otr/", true )) + "fingerprints", NULL, NULL);	
+	otrl_privkey_read_fingerprints(userstate, TQString("%1%2").arg(TDEGlobal::dirs()->saveLocation("data", "kopete_otr/", true )).arg("fingerprints").local8Bit(), NULL, NULL);
 
 }
 
@@ -980,7 +982,7 @@ void OtrlChatInterface::checkFilePermissions( TQString file ){
 			privkeysInfo.permission( TQFileInfo::WriteOther ) |
 			privkeysInfo.permission( TQFileInfo::ExeOther ) ){
 			kdDebug() << "Permissions of OTR storage file are wrong! Correcting..." << endl;
-			chmod( file, 0600);	
+			chmod( file.local8Bit(), 0600);
 		}
 	}
 
@@ -1065,8 +1067,8 @@ KeyGenThread::KeyGenThread( TQString accountname, TQString protocol ){
 void KeyGenThread::run()
 {
 	kdDebug() << "Creating private key... Storing to: " + TQString(TDEGlobal::dirs()->saveLocation("data", "kopete_otr/", true)) + "privkeys" << endl;
-	otrl_privkey_generate(OtrlChatInterface::self()->getUserstate(), TQString(TDEGlobal::dirs()->saveLocation("data", "kopete_otr/", true )) + "privkeys", accountname, protocol);
-	OtrlChatInterface::self()->checkFilePermissions( TQString(TDEGlobal::dirs()->saveLocation("data", "kopete_otr/", true )) + "privkeys" );
+	otrl_privkey_generate(OtrlChatInterface::self()->getUserstate(), TQString("%1%2").arg(TDEGlobal::dirs()->saveLocation("data", "kopete_otr/", true )).arg("privkeys").local8Bit(), accountname.latin1(), protocol.latin1());
+	OtrlChatInterface::self()->checkFilePermissions( TQString("%1%2").arg(TDEGlobal::dirs()->saveLocation("data", "kopete_otr/", true )).arg("privkeys").local8Bit() );
 }
 
 #include "otrlchatinterface.moc"
diff --git a/src/otrlconfinterface.cpp b/src/otrlconfinterface.cpp
index 812326d..5b4f6f0 100644
--- a/src/otrlconfinterface.cpp
+++ b/src/otrlconfinterface.cpp
@@ -83,7 +83,7 @@ bool OtrlConfInterface::hasPrivFingerprint( TQString accountId, TQString protoco
 
 
 void OtrlConfInterface::generateNewPrivKey( TQString accountId, TQString protocol ){
-	PrivKeyPopup *popup = new PrivKeyPopup( preferencesDialog, i18n("Generating private key"),  TQt::WType_Dialog | TQt::WStyle_StaysOnTop );
+	PrivKeyPopup *popup = new PrivKeyPopup( preferencesDialog, i18n("Generating private key").utf8(), TQt::WType_Dialog | TQt::WStyle_StaysOnTop );
 	KAnimWidget *anim = new KAnimWidget( "kde", 72, popup->animFrame, "kopete" );
 	anim->start();
 	anim->show();
@@ -115,7 +115,7 @@ TQValueList<TQString[5]> OtrlConfInterface::readAllFingerprints(){
 				entry[1] = i18n("Unused");
 			} else {
 				if (context && context->msgstate == OTRL_MSGSTATE_ENCRYPTED) {
-					if (context->active_fingerprint->trust && context->active_fingerprint->trust[0] != NULL) {
+					if (context->active_fingerprint->trust && context->active_fingerprint->trust[0] != 0) {
 						entry[1] = i18n("Private");
 					} else {
 						entry[1] = i18n("Unverified");
@@ -149,7 +149,7 @@ void OtrlConfInterface::verifyFingerprint( TQString strFingerprint, bool trust )
 			otrl_context_set_trust( fingerprint, NULL );
 		}
 		kdDebug() << "Writing fingerprints" << endl;
-		otrl_privkey_write_fingerprints( userstate, TQString(TDEGlobal::dirs()->saveLocation("data", "kopete_otr/", true )) + "fingerprints" );
+		otrl_privkey_write_fingerprints( userstate, TQString("%1%2").arg(TDEGlobal::dirs()->saveLocation("data", "kopete_otr/", true )).arg("fingerprints").local8Bit() );
 	} else {
 		kdDebug() << "could not find fingerprint" << endl;
 	}
@@ -158,7 +158,7 @@ void OtrlConfInterface::verifyFingerprint( TQString strFingerprint, bool trust )
 bool OtrlConfInterface::isVerified( TQString strFingerprint ){
 	Fingerprint *fingerprint;	
 
-	fingerprint = findFingerprint( strFingerprint );
+	fingerprint = findFingerprint( strFingerprint.latin1() );
 
 	if( fingerprint->trust && fingerprint->trust[0] ){
 		kdDebug() << "found trust" << endl;
@@ -175,7 +175,7 @@ void OtrlConfInterface::forgetFingerprint( TQString strFingerprint ){
 	
 	fingerprint = findFingerprint( strFingerprint );
 	otrl_context_forget_fingerprint( fingerprint, 1 );
-	otrl_privkey_write_fingerprints( userstate, TQString(TDEGlobal::dirs()->saveLocation("data", "kopete_otr/", true )) + "fingerprints" );
+	otrl_privkey_write_fingerprints( userstate, TQString("%1%2").arg(TDEGlobal::dirs()->saveLocation("data", "kopete_otr/", true )).arg("fingerprints").local8Bit() );
 }
 
 Fingerprint *OtrlConfInterface::findFingerprint( TQString strFingerprint ){
diff --git a/src/smppopup.cpp b/src/smppopup.cpp
index 66f28c1..0a550cc 100644
--- a/src/smppopup.cpp
+++ b/src/smppopup.cpp
@@ -74,7 +74,7 @@ void SMPPopup::openHelp()
 }
 
 void SMPPopup::manualAuth(){
-	VerifyPopup *vfPopup = new VerifyPopup(this, i18n("Verify Fingerprint"), session);
+	VerifyPopup *vfPopup = new VerifyPopup(this, i18n("Verify Fingerprint").utf8(), session);
 	vfPopup->show();
 	this->close();
 }