JIconButton.java A simple button that the user can select to load the entered URL. 
import javax.swing.*;

/** A regular JButton created with an ImageIcon and with borders
 *  and content areas turned off.
 *
  */

public class JIconButton extends JButton {
  public JIconButton(String file) {
    super(new ImageIcon(file));
    setContentAreaFilled(false);
    setBorderPainted(false);
    setFocusPainted(false);
  }
}