function check_newsletter_form(text_id) {
   var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
   var address = document.getElementById(text_id).value;
   if(reg.test(address) == false) {
      document.getElementById(text_id).style.border = '2px solid #FF6600';
	  document.getElementById('alert_news').innerHTML = 'Wrong email address!';
	  return false;
   }
   else return true;
}