The following program returns error : e2035 not enough actual parameters in 2 places (lines 39 and 45) and is not compiling. Can someone please help me out? Can I put 0 or null in place of parameters here?

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs,ComObj,shdocvw,activex, StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
  var
   mybrowser : iwebbrowser2;
  myUserName,
myPassword,loginURL : string;
    Flags: OleVariant;

begin
    Flags :=  navOpenInNewWindow;
     MyBrowser := CreateOleObject('InternetExplorer.Application') as IWebBrowser2;
MyBrowser.Navigate('http://www.gmail.com',flags,'_blank');

myUserName := 'UserName';
myPassword := 'password';
loginURL:='javascript:var Email = document.getElementById(''Email'');Email.value=''' + myUserName + ''';var Password = document.getElementById(''Passwd'');Password.value=''' + myPassword + ''';var SignIn = document.getElementById(''signIn'');SignIn.click();';

MyBrowser.Navigate(loginURL);

end;

end.