var calendar = null; // remember the calendar object so that we reuse
// it and avoid creating another

// This function gets called when an end-user clicks on some date
function selected(cal, date) {
	cal.sel.value = date; // just update the value of the input field
}

// And this gets called when the end-user clicks on the _selected_ date,
// or clicks the "Close" (X) button.  It just hides the calendar without
// destroying it.
function closeHandler(cal) {
	cal.hide();			// hide the calendar

	// don't check mousedown on document anymore (used to be able to hide the
	// calendar when someone clicks outside it, see the showCalendar function).
	Calendar.removeEvent(document, "mousedown", checkCalendar);
}

// This gets called when the user presses a mouse button anywhere in the
// document, if the calendar is shown.  If the click was outside the open
// calendar this function closes it.
function checkCalendar(ev) {
	var el = Calendar.is_ie ? Calendar.getElement(ev) : Calendar.getTargetElement(ev);
	for (; el != null; el = el.parentNode)
	// FIXME: allow end-user to click some link without closing the
	// calendar.  Good to see real-time stylesheet change :)
	if (el == calendar.element || el.tagName == "A") break;
	if (el == null) {
		// calls closeHandler which should hide the calendar.
		calendar.callCloseHandler(); Calendar.stopEvent(ev);
	}
} 

function showCalendar(id) {
	var el = document.getElementById(id);
	if (calendar != null) {
		// we already have one created, so just update it.
		calendar.hide();		// hide the existing calendar
		calendar.parseDate(el.value); // set it to a new date
	} else {
		// first-time call, create the calendar
		var cal = new Calendar(true, null, selected, closeHandler);
		calendar = cal;		// remember the calendar in the global
		cal.setRange(1900, 2070);	// min/max year allowed
		calendar.create();		// create a popup calendar
		calendar.parseDate(el.value); // set it to a new date
	}
	calendar.sel = el;		// inform it about the input field in use
	calendar.showAtElement(el);	// show the calendar next to the input field

	// catch mousedown on the document
	Calendar.addEvent(document, "mousedown", checkCalendar);
	return false;
} 

function IsEmailValid(emailStr)
{
	var checkTLD=1;
	var knownDomsPat=/^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum)$/;
	var emailPat=/^(.+)@(.+)$/;
	var specialChars="\\(\\)><@,;:\\\\\\\"\\.\\[\\]";
	var validChars="\[^\\s" + specialChars + "\]";
	var quotedUser="(\"[^\"]*\")";
	var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/;
	var atom=validChars + '+';
	var word="(" + atom + "|" + quotedUser + ")";
	var userPat=new RegExp("^" + word + "(\\." + word + ")*$");
	var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$");
	var matchArray=emailStr.match(emailPat);
	
	if (matchArray==null) {
		return false;
	}

	var user=matchArray[1];
	var domain=matchArray[2];
	for (i=0; i<user.length; i++) {
		if (user.charCodeAt(i)>127) {
			return false;
   		}
	}
	for (i=0; i<domain.length; i++) {
		if (domain.charCodeAt(i)>127) {
			return false;
		}
	}
	if (user.match(userPat)==null) {
		return false;
	}
	var IPArray=domain.match(ipDomainPat);
	if (IPArray!=null) {
	for (var i=1;i<=4;i++) {
		if (IPArray[i]>255) {
			return false;
		}
	}
	return true;
	}
 
	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) {
			return false;
		}
	}
	if (checkTLD && domArr[domArr.length-1].length!=2 && domArr[domArr.length-1].search(knownDomsPat)==-1) {
		return false;
	}
	if (len<2) {
		return false;
	}
	return true;
}

function checkRejestracjaForm() {
	var field_firstname = xbGetElementById('imie');
	var field_surname = xbGetElementById('nazwisko');
	var field_email = xbGetElementById('email');
	var field_tel = xbGetElementById('tel');
	var field_specjalizacja = xbGetElementById('specjalizacja');
    
  if (field_firstname.value == '') {
		alert('Proszę podać swoje imię!');
		return false;
	} else  
  if (field_surname.value == '') {
		alert('Proszę podać swoje nazwisko!');
		return false;
	} else  
  if (IsEmailValid(field_email.value)==false) {
		alert('Proszę podać prawidłowy adres e-mail!');
		return false;
	} else 
  if (field_tel.value == '') {
		alert('Proszę podać numer telefonu kontaktowego!');
		return false;
	} else 
  if (field_specjalizacja.value == '') {
		alert('Proszę wybrać interesującą Państwa specjalizację!');
		return false;
	} else return true;
}

function checkKontaktForm() {
	var field_firstname = xbGetElementById('imie');
	var field_surname = xbGetElementById('nazwisko');
	var field_email = xbGetElementById('email');
	var field_subject = xbGetElementById('temat');
	var field_msg = xbGetElementById('tresc');
    
  if (field_firstname.value == '') {
		alert('Proszę podać swoje imię!');
		return false;
	} else  
  if (field_surname.value == '') {
		alert('Proszę podać swoje nazwisko!');
		return false;
	} else  
  if (IsEmailValid(field_email.value)==false) {
		alert('Proszę podać prawidłowy adres e-mail!');
		return false;
	} else 
  if (field_subject.value == '') {
		alert('Proszę wpisać temat wiadomości!');
		return false;
	} else 
  if (field_msg.value == '') {
		alert('Proszę wpisać treść wiadomości!');
		return false;
	} else return true;
}