document.writeln( "<form name=\"virtualLoginForm\" method=\"post\" >"+
"<input type=\"hidden\" id=\"user_login_inmyform\" name=\"login\" value=\"\">"+
"<input type=\"hidden\" id=\"user_password_inmyform\" name=\"password\" value=\"\">"+
"</form>" );
 function doLogin() {
    var login = document.getElementById("user_login").value;
    var password = document.getElementById("user_password").value;
     document.getElementById("user_login_inmyform").value=login;
     document.getElementById("user_password_inmyform").value=password;
     document.virtualLoginForm.target = "_new";
     document.virtualLoginForm.action='http://www.registre-commerce.tn/search/RCCUserManagement.do?action=login';
     document.virtualLoginForm.submit();
     document.virtualLoginForm.target = "_self";
  }