function isUsername(stremail)
{
 	if (stremail.search(/^[A-Za-z0-9]+$/) == -1)
		return false;
	else
		return true;
}

function isEmail(stremail)
{
 	if (stremail.search(/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/) == -1)
		return false;
	else
		return true;
}