function check_sub() {
  if ( (document.ebform.email_addr.value != "") && (document.ebform.email_addr.value != "your email address here") ) {
    tst=document.ebform.email_addr.value.indexOf("@")+1;
    tst2=document.ebform.email_addr.value.indexOf(".")+1;
    var myString=document.ebform.email_addr.value;
    var newString = myString.match(/\b(^(\S+@).+((\.com)|(\.net)|(\.edu)|(\.mil)|(\.gov)|(\.org)|(\.pro)|(\.info)|(\.biz)|(\..{2,2}))$)\b/gi);
    if (!newString || tst==0 || tst2==0) {
      alert("Please provide a valid email address");
      return false;
    }
    document.ebform.submit();
//  test.focus();
    return false;
  }
  else {
    alert("Please provide a valid email address");
    return false;
  }
}