/*
Dodaj v hmtl 

<form name=emailform onSubmit="return emailCheck(this.email.value)">
	Your Email Address:  <input type=text name="email"><br>
	<input type=submit value="Submit">
</form>

*/

function fotona_Inf_IsMail(id, value){
	/*	Ker gre za blur event (on focus out) sem funkciji poslal id input box-a, 
		ker pa v input box vpisujem "Required field missing" èe je polje prazno
		moram najprej preveriti èe je vrednost enaka tej vrednosti, ki jo pošiljam
		skozi spremenljivko value.	*/
	var email = document.getElementById(id).value
	if (value != email) { emailCheck(email); }
}

function emailCheck (emailStr) {
	/*	The following variable tells the rest of the function whether or not
		to verify that the address ends in a two-letter country or well-known
		TLD.  1 means check it, 0 means don't. 	*/
	var checkTLD=1;
	
	//	The following is the list of known TLDs that an e-mail address must end with.
	var knownDomsPat=/^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum)$/;

	/*	The following pattern is used to check if the entered e-mail address
		fits the user@domain format.  It also is used to separate the username
		from the domain.	*/
	var emailPat=/^(.+)@(.+)$/;

	/*	The following string represents the pattern for matching all special
		characters.  We don't want to allow special characters in the address. 
		These characters include ( ) < > @ , ; : \ " . [ ] 	*/
	var specialChars="\\(\\)><@,;:\\\\\\\"\\.\\[\\]";

	/*	The following string represents the range of characters allowed in a 
		username or domainname.  It really states which chars aren't allowed.	*/
	var validChars="\[^\\s" + specialChars + "\]";

	/*	The following pattern applies if the "user" is a quoted string (in
		which case, there are no rules about which characters are allowed
		and which aren't; anything goes).  E.g. "jiminy cricket"@disney.com
		is a legal e-mail address.	*/
	var quotedUser="(\"[^\"]*\")";

	/*	The following pattern applies for domains that are IP addresses,
		rather than symbolic names.  E.g. joe@[123.124.233.4] is a legal
		e-mail address. NOTE: The square brackets are required.	*/
	var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/;

	//	The following string represents an atom (basically a series of non-special characters.) 
	var atom=validChars + '+';

	/*	The following string represents one word in the typical username.
		For example, in john.doe@somewhere.com, john and doe are words.
		Basically, a word is either an atom or quoted string.	*/
	var word="(" + atom + "|" + quotedUser + ")";

	//	The following pattern describes the structure of the user
	var userPat=new RegExp("^" + word + "(\\." + word + ")*$");

	/*	The following pattern describes the structure of a normal symbolic
		domain, as opposed to ipDomainPat, shown above. */
	var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$");

	// Finally, let's start trying to figure out if the supplied address is valid.

	/*	Begin with the coarse pattern to simply break up user@domain into
		different pieces that are easy to analyze. */
	var matchArray=emailStr.match(emailPat);

	if (matchArray==null) {
		/*	Too many/few @'s or something; basically, this address doesn't
			even fit the general mould of a valid e-mail address.	*/
		if (g_jezik_S == 'si'){
			alert("Email address seems incorrect (check @ and .'s)");
		}
		else if (g_jezik_S == 'es'){
			alert("La dirección de correo electrónico aparece incorrecta (chequee @ y .’s)");
		}
		else{
			alert("Email address seems incorrect (check @ and .'s)");
		}
		return false;
	}
	
	var user=matchArray[1];
	var domain=matchArray[2];

	// Start by checking that only basic ASCII characters are in the strings (0-127).
	for (i=0; i<user.length; i++) {
		if (user.charCodeAt(i)>127) {
			if (g_jezik_S == 'si'){
				alert("This username contains invalid characters.");
			}
			else if (g_jezik_S == 'es'){
				alert("This username contains invalid characters.");
			}
			else{
				alert("This username contains invalid characters.");
			}
			return false;
		}
	}
	for (i=0; i<domain.length; i++) {
		if (domain.charCodeAt(i)>127) {
			if (g_jezik_S == 'si'){
				alert("This domain name contains invalid characters.");
			}
			else if (g_jezik_S == 'es'){
				alert("This domain name contains invalid characters.");
			}
			else{
				alert("This domain name contains invalid characters.");
			}
			return false;
		}
	}

	// See if "user" is valid 
	if (user.match(userPat)==null) {
		// user is not valid
		if (g_jezik_S == 'si'){
			alert("The username doesn't seem to be valid.");
		}
		else if (g_jezik_S == 'es'){
			alert("The username doesn't seem to be valid.");
		}
		else{
			alert("The username doesn't seem to be valid.");
		}
		return false;
	}

	/*	if the e-mail address is at an IP address (as opposed to a symbolic
		host name) make sure the IP address is valid.	*/
	var IPArray=domain.match(ipDomainPat);

	if (IPArray!=null) {
		// this is an IP address
		for (var i=1;i<=4;i++) {
			if (IPArray[i]>255) {
				if (g_jezik_S == 'si'){
					alert("Destination IP address is invalid!");
				}
				else if (g_jezik_S == 'es'){
					alert("Destination IP address is invalid!");
				}
				else{
					alert("Destination IP address is invalid!");
				}
				return false;
			}
		}
		return true;
	}

	// Domain is symbolic name.  Check if it's valid.
	var atomPat=new RegExp("^" + atom + "$");
	var domArr=domain.split(".");
	var len=domArr.length;
	
	for (i=0;i<len;i++) {
		if (domArr[i].search(atomPat)==-1) {
			if (g_jezik_S == 'si'){
				alert("The domain name does not seem to be valid.");
			}
			else if (g_jezik_S == 'es'){
				alert("The domain name does not seem to be valid.");
			}
			else{
				alert("The domain name does not seem to be valid.");
			}
			return false;
		}
	}

	/*	domain name seems valid, but now make sure that it ends in a
		known top-level domain (like com, edu, gov) or a two-letter word,
		representing country (uk, nl), and that there's a hostname preceding 
		the domain or country.	*/
	if (checkTLD && domArr[domArr.length-1].length!=2 && domArr[domArr.length-1].search(knownDomsPat)==-1) {
		if (g_jezik_S == 'si'){
			alert("The address must end in a well-known domain or two letter " + "country.");
		}
		else if (g_jezik_S == 'es'){
			alert("The address must end in a well-known domain or two letter " + "country.");
		}
		else{
			alert("The address must end in a well-known domain or two letter " + "country.");
		}
		return false;
	}

	// Make sure there's a host name preceding the domain.
	if (len<2) {
		if (g_jezik_S == 'si'){
			alert("This address is missing a hostname!");
		}
		else if (g_jezik_S == 'es'){
			alert("This address is missing a hostname!");
		}
		else{
			alert("This address is missing a hostname!");
		}
		return false;
	}

	// If we've gotten this far, everything's valid!
	return true;
}