function IsEmailAddress(str) {
	
	  var matchResult =(str.match(/^([a-zA-Z0-9])+([\.a-zA-Z0-9_-])*@([a-zA-Z0-9_-])+(\.[a-zA-Z0-9_-]+)+/));

    if (matchResult == null)
      return false;
    else
      return true;
	}



  function EmailAddressCustomValidation(source, arguments)
  {
    arguments.IsValid = IsEmailAddress(arguments.Value);
  }