Error in image panel class of java : error:image panel cannot be resolved to a type

How to use image panel class,here it is showing error:image panel cannot be resolved to a type! How to create an image panel class object

public void start() 
{ 
   ImagePanel im=new ImagePanel("C:/om1.jpg");//ERROR:image panel cannot be       resolved to a type 
   add(im); 
   setSize(400,400); 
   setVisible(true); 
   addMouseListener(this); 
   addMouseMotionListener( this ); 
   setDefaultCloseOperation(EXIT_ON_CLOSE);
}