How to make WebBrowser wait for Javascript?

this.WebBrowser.Navigate(string.Format("http://facenama.com/{0}", "MeysamTM"));

while (this.WebBrowser.ReadyState != WebBrowserReadyState.Complete)
   Application.DoEvents();

foreach (string contact in this.Contacts.Items)
{
    this.WebBrowser.Document.InvokeScript("postform_open");

    object[] args = new object[1] { contact };

    this.WebBrowser.Document.InvokeScript("postform_sharewith_user", args);

    this.WebBrowser.Document.Window.Frames[0].Document.GetElementsByTagName("body")[0].InnerHtml = this.Message.Text;

    this.WebBrowser.Document.InvokeScript("postform_submit");
}