ocw91 0 Newbie Poster

i am a beginner here, now i am having trouble adding function to the buttons.(i have no idea what to do so might need deep explaination on everything)
i totally don't know how to add function onto the button.
here is my code:
Second part is servlet

<%@page import="ejb.CartServlet"%>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>

<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
        <script>
            function appleFunction()
            {
                alert("Apple is added!");
            }
            function grapeFunction()
            {
                alert("Grape is added!");
            }
            function peachFunction()
            {
                alert("Peach is added!");
            }
            function kiwiFunction()
            {
                alert("Kiwi is added!");
            }
        </script>
    </head>
    <body>
        <h1>Fruits Corder</h1>
        <h6>Customer Name:</h6>
        <form action="CartServlet" method="post">
        <input type ="text" name="customerName1">
        <input type="button" name="login" value="Login" onclick=""></input>
        <h5>Adding fruits to cartBean for a customer</h5>
        <table>
            <th>Item</th>
            <th>Item Name</th>            
            <tr>
                <td><img src="apple.jpg" alt="applePic" width="100" height="100"></td>                
                <td><input type="text" name="appleName" value="Apple"></td>
                <td><input type="button" name="addbut1" value="Add" onclick=""></td>                
                <td><input type="button" name="remove1" value="Remove" onclick=""></td>              
            </tr>
            <tr>
                <td><img src="grape.png" alt="grapePic" width="100" height="100"></td>              
                <td><input type="text" name="grapeName" value="Grape"></td>
                <td><input type="button" name="addbut2" value="Add"></td>                    
                <td><input type="button" name="remove2" value="Remove" onclick=""></td>
            </tr>  
            <tr>
                <td><img src="peach.jpg" alt="peachPic" width="100" height="100"></td>
                <td><input type="text" name="peachName" value="Peach"></td>
                <td><input type="button" name="addbut3" value="Add"></td>    
                <td><input type="button" name="remove3" value="Remove" onclick=""></td>
            </tr>
            <tr>
                <td><img src="kiwi.jpg" alt="kiwiPic" width="100" height="100"></td>               
                <td><input type="text" name="kiwiName" value="Kiwi"></td>
                <td><input type="button" name="addbut4" value="Add"></td>    
                <td><input type="button" name="remove4" value="Remove" onclick=""></td>
            </tr>

        </table>
        <h1>Cart List</h1>
        <input type="submit" name="update" value="Update">
        <input type="button" name="refresh" value="Refresh">
        </form>
    </body>
</html>


package ejb;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.ejb.EJB;


/**
 *
 * @author chiewwei
 */
@WebServlet(name = "CartServlet", urlPatterns = {"/CartServlet"})
public class CartServlet extends HttpServlet {

    @EJB
    private CartBeanRemote myCartBean;

  //  CartBeanRemote cartBean = lookupCartBeanRemote();
    public void login(){
        myCartBean.initialize("ken", "189");
    }

    public void addApple(HttpServletRequest request,HttpServletResponse response){
        String name = request.getParameter("appleName");
        myCartBean.addItem(name);
    }

    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        String name1 = request.getParameter("grapeName");
        String name2 = request.getParameter("peachName");
        String name3 = request.getParameter("kiwiName");

        myCartBean.addItem(name1);
        myCartBean.addItem(name2);
        myCartBean.addItem(name3);

        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        try {
            /* TODO output your page here. You may use following sample code. */
            out.println("<!DOCTYPE html>");
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Servlet CartServlet</title>");            
            out.println("</head>");
            out.println("<body>");
            out.println("<h1>" + myCartBean.getItems() + "</h1>");
            out.println("</body>");
            out.println("</html>");
        } finally {            
            out.close();
        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP
     * <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP
     * <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

 /**   private CartBeanRemote lookupCartBeanRemote() {
        try {
            Context c = new InitialContext();
            return (CartBeanRemote) c.lookup("java:global/EJBCartApp/EJBCartApp-ejb/CartBean!ejb.CartBeanRemote");
        } catch (NamingException ne) {
            Logger.getLogger(getClass().getName()).log(Level.SEVERE, "exception caught", ne);
            throw new RuntimeException(ne);
        }
    }*/
}
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