function checkEmail(email)
{
  var reg = /^([a-zA-Z0-9_-])+.*@([a-zA-Z0-9_-])+((\.[a-zA-Z0-9_-]{2,3}){1,2})$/;
  return (email.match(reg));
}

function isNumber(variable)
{
  var reg = /^\d+$/;
  return (reg.test(variable));
}

function cleanVisitHistory()
{	
	document.cleanVisitHistory.submit();
}