/*********************************************************************************
 * check_email.js - Check email format
 *
 * Description:	This script checks for a well-formed e-mail address
 *						in the format: user@domain.com.
 *  
 ********************************************************************************/


function checkEmail(emailAddr)
{
	var i;
	
	// check for @
	i = emailAddr.indexOf("@");
	if (i == -1)
	{
		return false;
	}
	
	// separate the user name and domain
	var username = emailAddr.substring(0, i);
	var domain = emailAddr.substring(i + 1, emailAddr.length);

	// look for spaces at the beginning of the username
	i = 0;
	while ((username.substring(i, i + 1) == " ") && (i < username.length))
	{
		i++;
	}
	// remove any found
	if (i > 0)
	{
		username = username.substring(i, username.length);
	}

	// look for spaces at the end of the domain
	i = domain.length - 1;
	while ((domain.substring(i, i + 1) == " ") && (i >= 0))
	{
		i--;
	}
	// remove any found
	if (i < (domain.length - 1))
	{
		domain = domain.substring(0, i + 1);
	}

	// make sure neither the username nor domain is blank
	if ((username == "") || (domain == ""))
	{
		return false;
	}
	
	// check for bad characters in the username
	var ch;
	for (i = 0; i < username.length; i++)
	{
		ch = (username.substring(i, i + 1)).toLowerCase();
		if (!(((ch >= "a") && (ch <= "z")) || ((ch >= "0") && (ch <= "9")) ||
			(ch == "_") || (ch == "-") || (ch == ".")))
		{
				return false;
		}
	}
	
	// check for bad characters in the domain
	for (i = 0; i < domain.length; i++)
	{
		ch = (domain.substring(i, i + 1)).toLowerCase();
		if (!(((ch >= "a") && (ch <= "z")) || ((ch >= "0") && (ch <= "9")) ||
			(ch == "_") || (ch == "-") || (ch == ".")))
		{
				return false;
		}
	}

	var aSuffix = new Array("com","edu","org","gov","mil","ca", "net", "au", "es");
	var bFoundSuffix = false;
	i = 0;
	while (i < aSuffix.length)
	{
		if (("." + aSuffix[i]) == domain.substring(domain.length - aSuffix[i].length - 1, domain.length))
		{
			return true;
		}
		i++;
	}
	// we would have exited if we'd found a good suffix, so return false
	return false;
}

function emailOK(emailAddr) 
{
	if (!(checkEmail(emailAddr)))
		alert("Please make sure your e-mail address is entered in the right format.");
	else
		document.fName.submit();
}