function isEmail(strEmail){
	validRegExp = /^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i
	if (strEmail.search(validRegExp) == -1)
	{
		alert('Please insert a valid email address');
		return false;
	}
	return true;
}