public void onClick(View v) {
		if( v == voltar ) {
			setResult( RESULT_CANCELED );
			finish( );
		}
		else if( v == avancar ) {
			if( ! Utils.validateCPF( editCPF ) ) return;
			if( ! Utils.validateEmail( editEmail ) ) return;

			final ProgressDialog dialog = ProgressDialog.show( this, "Verificando", "Por favor, aguarde...", true );
			final String edCpf = editCPF.getCleanText();
			final String edEmail = editEmail.getText().toString();
			final Activity instance = this;

			Runnable runnable = new Runnable() {
				public void run() {

					String reqUrl = "http://url/login?";
					String reqParams = "";
					try {
						reqParams = "cpf=" + URLEncoder.encode( edCpf, "UTF-8" ) +"&email=" +/* URLEncoder.encode( edEmail, "UTF-8" )*/ (String) edEmail;
					} catch (UnsupportedEncodingException e1) {
						e1.printStackTrace();
					}
	                     Log.d("",reqUrl + reqParams);
					StringBuilder is = Utils.sendHttpGet( reqUrl + reqParams );
                             
					instance.runOnUiThread( new Runnable() {
						public void run() {
							dialog.dismiss( );
						}
					});

					String msg = null;
					if( is == null ) {
						msg = "Erro ao verificar cadastro.\nCertifique-se de que a conexão com a internet esteja ativada e tente novamente.";
					}
					else {
						msg = "Erro interno ao verificar cadastro.";
						DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
						try {
							DocumentBuilder builder = factory.newDocumentBuilder( );
							Document dom = builder.parse( new ByteArrayInputStream( is.toString().getBytes() ) );
							Element  root = dom.getDocumentElement( );
							NodeList list = root.getElementsByTagName( "UserClientEntity" );
							if( list.getLength() < 1 ) {
								msg = "Usuário não encontrado.";
							}
							else {
								String cpf = "";
								msg = "Usuário não encontrado.";

								NodeList user = list.item( 0 ).getChildNodes( );
		
								for( int i = 0; i < user.getLength(); ++i ) {
									if( user.item( i ).getNodeName().equals( "cpf" ) ) {
										cpf = user.item( i ).getChildNodes().item(0).getNodeValue();
										if( cpf == null ) {
											cpf = "";
										}
										break;
									}
								}

								if( cpf.equals( edCpf ) ) {
			
									instance.runOnUiThread( new Runnable() {
										public void run() {
											LastLoginData.setCpf( edCpf );
											LastLoginData.setEmail( edEmail );
											LastLoginData.saveData( instance );

											setResult( RESULT_OK );
											finish( );
										}
									});
									msg = null;
								}
							}
						}
						catch( Exception e ) {
						}
					}
					if( msg != null ) {
						final String xmsg = msg;
						instance.runOnUiThread( new Runnable() {
							public void run() {
								Utils.showInformation( instance, "Atenção", xmsg );
							}
						});
					}
				}
			};
			Thread thread = new Thread( runnable );
			thread.start( );
		}
	}