function unhide(email) {
	var emailaddress;
	emailaddress = email.replace('<add-sign>', '@');
	emailaddress = emailaddress.replace(/[|]+/g,'');
	return emailaddress;
}

function ComposeMail(email) {
	window.location.href=unhide(email)
}

var mailit = "m|a|i|l|t|o|:";
var user = "i|n|f|o|<add-sign>de|r|oo|s|a|uto|s|.nl";

function checkPhoneNumber () {
var str=document.getElementById('telefoon').value;
//checkPhoneNumber kijk of de string een 10 cijferig getal bevat
//andere tekens of tekst wordt genegeerd alleen de cijfers tellen mee
  var antw = str.match(/\d/ig);    
  var telnr = "";
  if (antw != null) {
	  for (i=0;i<antw.length;i++) {
	  	telnr += antw[i];
	  }
		if (telnr.length != 10) {
			alert ("Telefoonnummer te kort (10 cijfers nodig).\n uw nr: "+telnr);
			return false;
		}
		else {
			document.getElementById('telefoon').value = telnr;
		}
	}
	else {
		alert ("Telefoonnummer mag alleen uit cijfers bestaan.");
		return false;
	}
	return true;
}

function emailCheck () {	
var emailStr=document.getElementById('visitorEmail').value;
/* 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. */
	alert("Email adres is niet correct (controlleer op '@' en '.')");
	return false;
}
var user=matchArray[1];
var domain=matchArray[2];

// See if "user" is valid 
if (user.match(userPat)==null) {
    // user is not valid
    alert("Uw e-mail adres lijkt niet correct te zijn. (fout in het deel voor '@')");
    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) {
	        alert("Het opgegeven IP-adres (achter '@') lijkt niet correct te zijn.");
					return false;
	    }
    }
    return true;
}

// Domain is symbolic name
var domainArray=domain.match(domainPat);
if (domainArray==null) {
	alert("Uw e-mail adres lijkt niet correct te zijn. (fout in het deel achter '@')");
  return false;
}

/* domain name seems valid, but now make sure that it ends in a
   three-letter word (like com, edu, gov) or a two-letter word,
   representing country (uk, nl), and that there's a hostname preceding 
   the domain or country. */

/* Now we need to break up the domain to get a count of how many atoms
   it consists of. */
var atomPat=new RegExp(atom,"g");
var domArr=domain.match(atomPat);
var len=domArr.length;
if (domArr[domArr.length-1].length<2 || 
    domArr[domArr.length-1].length>3) {
   // the address must end in a two letter or three letter word.
   alert("E-mail adressen moeten eindigen op 2 of 3 letters na de punt.");
   return false;
}

// Make sure there's a host name preceding the domain.
if (len<2) {
   var errStr="Uw e-mail adres is niet geldig. (De naam de domeinhost is te kort.)";
   alert(errStr);
   return false;
}

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

function formCheck () {
	if (document.getElementById('emailText').value == "") {
		alert ('Vult u a.u.b. een vraag in.');
		document.getElementById('emailText').focus();
		return false;
	}
	if (document.getElementById('visitorName').value == ""){
		alert ('Vult u a.u.b. uw naam in.');
		document.getElementById('visitorName').focus();
		return false;
	}
	if (!emailCheck()) {
		document.getElementById('visitorEmail').focus();
		return false;
	}
	if (!checkPhoneNumber()) {
		document.getElementById('telefoon').focus();
		return false;
	}	
}