Create and render the dialogs

 YAHOO.people.container.addUser = new YAHOO.widget.Dialog("addUserDlg",
    { width : "290px",
      context: ["buttonContainer", "br", "br"],
      draggable: true,
      visible : false,
      buttons : [ { text:"Submit", handler:handleSubmit, isDefault:true },
              { text:"Cancel", handler:handleCancel }
             ]
    });
 YAHOO.people.container.addUser.render();

 YAHOO.people.container.loginUser = new YAHOO.widget.Dialog("loginUserDlg",
    { width : "210px",
      context: ["buttonContainer", "br", "br"],
      draggable: true,
      visible : false,
      buttons : [ { text:"Login", handler:handleSubmit, isDefault:true },
              { text:"Cancel", handler:handleCancel }
             ]
    });
 YAHOO.people.container.loginUser.render();