function VerifForm (){
  var Msg="";
  var ErrorCount=0;
  var RegexEmail = /^[A-Za-z0-9](([_\.\-]?[a-zA-Z0-9]+)*)@([A-Za-z0-9]+)(([\.\-]?[a-zA-Z0-9]+)*)\.([A-Za-z]{2,})$/;
  var ResultEmail = RegexEmail.test(document.getElementById('dolist_form_email').value);
  if ((!ResultEmail)||(document.getElementById('dolist_form_email').value=='')){
    Msg = Msg + "\n   - e-mail";
    ErrorCount++;
  }

  if (ErrorCount!=0){
    Msg = "Following field cannot be left blank :\n" + Msg;
    alert (Msg);
    return false;
  }
  else {
    return true;
  }
}

$('dolist_form_email').onfocus = function() {
	  if (this._cleared) return;
	  this.clear();
	  this._cleared = true;
}