// form validation function //
function validate(form) {
	var name = form.name.value;
	var email = form.email.value;
	//var gender = form.gender.value;
	var subject = form.subject.value;
	var message = form.message.value;
	
	var nameRegex = /^[a-zA-Z]+(([\'\,\.\- ][a-zA-Z ])?[a-zA-Z]*)*$/;
	var emailRegex = /^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$/;
	var messageRegex = new RegExp(/<\/?\w+((\s+\w+(\s*=\s*(?:".*?"|'.*?'|[^'">\s]+))?)+\s*|\s*)\/?>/gim);
	
	if (name == "") {
		inlineMsg('name', 'Uzupełnij imię i nazwisko.', 2);
		return false;
	}
	if (!name.match(nameRegex)) {
		inlineMsg('name', 'Podałeś błędne imię i nazwisko.', 2);
		return false;
	}
	if (email == "") {
		inlineMsg('email',
				'<strong>Błąd</strong><br />Podaj adres e-mail.', 2);
		return false;
	}
	if (!email.match(emailRegex)) {
		inlineMsg(
				'email',
				'<strong>Błąd</strong><br />Podaj prawidłowy adres e-mail.',
				2);
		return false;
	}
	if (subject == "") {
		inlineMsg('subject',
				'<strong>Błąd</strong><br />Podaj temat wiadomości.', 2);
		return false;
	}
	if (message == "") {
		inlineMsg('message', 'Podaj wiadmość.');
		return false;
	}
	if (message.match(messageRegex)) {
		inlineMsg('message', 'Podałeś błędną wiadomość.');
		return false;
	}
	return true;
}

// START OF MESSAGE SCRIPT //

var MSGTIMER = 20;
var MSGSPEED = 5;
var MSGOFFSET = 3;
var MSGHIDE = 3;

// build out the divs, set attributes and call the fade function //
function inlineMsg(target, string, autohide) {
	var msg;
	var msgcontent;
	if (!document.getElementById('msg')) {
		msg = document.createElement('div');
		msg.id = 'msg';
		msgcontent = document.createElement('div');
		msgcontent.id = 'msgcontent';
		document.body.appendChild(msg);
		msg.appendChild(msgcontent);
		msg.style.filter = 'alpha(opacity=0)';
		msg.style.opacity = 0;
		msg.alpha = 0;
	} else {
		msg = document.getElementById('msg');
		msgcontent = document.getElementById('msgcontent');
	}
	msgcontent.innerHTML = string;
	msg.style.display = 'block';
	var msgheight = msg.offsetHeight;
	var targetdiv = document.getElementById(target);
	targetdiv.focus();
	var targetheight = targetdiv.offsetHeight;
	var targetwidth = targetdiv.offsetWidth;
	var topposition = topPosition(targetdiv) - ((msgheight - targetheight) / 2);
	var leftposition = leftPosition(targetdiv) + targetwidth + MSGOFFSET;
	msg.style.top = topposition + 'px';
	msg.style.left = leftposition + 'px';
	clearInterval(msg.timer);
	msg.timer = setInterval("fadeMsg(1)", MSGTIMER);
	if (!autohide) {
		autohide = MSGHIDE;
	}
	window.setTimeout("hideMsg()", (autohide * 1000));
}

// hide the form alert //
function hideMsg(msg) {
	var msg = document.getElementById('msg');
	if (!msg.timer) {
		msg.timer = setInterval("fadeMsg(0)", MSGTIMER);
	}
}

// face the message box //
function fadeMsg(flag) {
	if (flag == null) {
		flag = 1;
	}
	var msg = document.getElementById('msg');
	var value;
	if (flag == 1) {
		value = msg.alpha + MSGSPEED;
	} else {
		value = msg.alpha - MSGSPEED;
	}
	msg.alpha = value;
	msg.style.opacity = (value / 100);
	msg.style.filter = 'alpha(opacity=' + value + ')';
	if (value >= 99) {
		clearInterval(msg.timer);
		msg.timer = null;
	} else if (value <= 1) {
		msg.style.display = "none";
		clearInterval(msg.timer);
	}
}

// calculate the position of the element in relation to the left of the browser //
function leftPosition(target) {
	var left = 0;
	if (target.offsetParent) {
		while (1) {
			left += target.offsetLeft;
			if (!target.offsetParent) {
				break;
			}
			target = target.offsetParent;
		}
	} else if (target.x) {
		left += target.x;
	}
	return left;
}

// calculate the position of the element in relation to the top of the browser window //
function topPosition(target) {
	var top = 0;
	if (target.offsetParent) {
		while (1) {
			top += target.offsetTop;
			if (!target.offsetParent) {
				break;
			}
			target = target.offsetParent;
		}
	} else if (target.y) {
		top += target.y;
	}
	return top;
}

// preload the arrow //
if (document.images) {
	arrow = new Image(7, 80);
	arrow.src = "images/msg_arrow.gif";
}