function ValidateEmail(email,errorMessage)
{
	emailPattern = /^[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4}$/;
	if(!emailPattern.test(email))
	{
		if(errorMessage != "")
		{
			alert(errorMessage);
		}
		return false;
	}
	return true;
}