/* BASIC */

function center(sirka, vyska) {
	x = (window.screen.width/2) - (sirka/2 + 10);
	y = (window.screen.height/2) - (vyska/2 + 25);
	window.open("", "center", "width="+sirka+", height="+vyska+", left="+x+", top="+y+", status");
}

function display(hidden) {
	el = document.getElementById(hidden).style;
	el.display = (el.display == 'block') ? 'none' : 'block';
}

/* FORM */

function newsletter(formular) {
	var chyba = "";
	if (!formular.pocitace.checked && !formular.internet.checked && !formular.mobily.checked) chyba += "- oblast zájmu\n";
	if (formular.mail.value == "" || formular.mail.value == "váš e-mail") chyba += "- Váš e-mail\n";
	if (chyba) {
		alert("Níže uvedená pole nejsou vyplněna:\n\n" + chyba);
	}
	else {
		pocitace = formular.pocitace.checked ? 1 : 0;
		internet = formular.internet.checked ? 1 : 0;
		mobily = formular.mobily.checked ? 1 : 0;
		if (typeof window.ActiveXObject != "undefined") httpRequest = new ActiveXObject("Microsoft.XMLHTTP");
		else httpRequest = new XMLHttpRequest();
		httpRequest.open("GET", "./newsletter-inc.php?mail=" + formular.mail.value + "&pocitace=" + pocitace + "&internet=" + internet + "&mobily=" + mobily, true);
		httpRequest.onreadystatechange = function() {
			setTimeout(function() {
					document.getElementById("newsletter").innerHTML = httpRequest.responseText;
			}, 100)
		}
		httpRequest.send(null);
	}
	return false;
}

function kontrola_newsletter(formular) {
	if (!formular.mail.value) return false;
}