Uncaught ReferenceError: daisy is not defined

 while(rs.next())
                        {
                         String friendname = rs.getString(2);
                         
                         out.print("<table><tbody><tr><td>"+rs.getString(2));              
                         out.print("  <script src='http://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js'></script>");
                         out.print(" <script src=\"js/index.js\"></script>");
                        // out.print("<button type=\"button\" onclick=friendnamebtn() id=\"btn_friends\">");
                       // out.print("<button type=\"button\" onclick='javascript:return friendnamebtn(this)' id=\"btn_friends\">");
                         out.print("<button type=\"button\" onclick='javascript:return friendnamebtn("+ friendname +")' id=\"btn_friends\">");
                         out.print("Add" + friendname);
                         out.print("</button>");
                         out.print("</td></tr></tbody></table>");
               
                     }
                     out.print(""); 

javascript code

function friendnamebtn(friendname){
 //   var friends = document.getElementById("btn_friends");
    alert(friendname+"add");
}