how to desidn login form and jump into website using implict intent

package com.example.sum;

import android.net.Uri;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener{
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
if (arg0.getId()==R.id.button2)
{
username=et1.getText().toString();
paswd=et2.getText().toString();
if(username.equals("sumeet")&& paswd.equals("123"))
{
Toast toast=Toast.makeText(getApplicationContext(),"success",Toast.LENGTH_SHORT);
toast.setMargin(50,50);
toast.show();
Intent intent=new Intent(Intent.ACTION_VIEW);
intent.setData(Uri.parse("http://www.facebook.com"));
startActivity(intent);
et1.setText("*******");
et2.setText("*******");

}
else
{
Toast.makeText(getApplicationContext(),"warning wrong password",Toast.LENGTH_SHORT).show();

}}
else
{
finish();
}
}

Button b1,b2;
EditText et1,et2;
String username,paswd;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        b1=(Button) findViewById(R.id.button1);
        b1.setOnClickListener(this);
        b2=(Button) findViewById(R.id.button2);
        b2.setOnClickListener(this);
        et1=(EditText) findViewById(R.id.editText1);
        et2=(EditText) findViewById(R.id.editText2);
        et1.setOnClickListener(this);
        et2.setOnClickListener(this);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }
   
}