function writeSWF() {
	var c = document.getElementById("banner");
	if (!c) {
		var d = document.createElement("div");
		d.setAttribute("id", "banner");
		document.getElementById("banner-container").appendChild(d);
	}
	// create SWF
	var att = { data:"/img/flash/banner_over.swf", width:"505", height:"325" };
	var par = { wmode:"transparent" };
	var id = "banner";
	swfobject.createSWF(att, par, id);
	}

function removeSWF() {
	swfobject.removeSWF("banner");
}

function kontrola(form) {
    var object = form.elements[i];
    var co = document.getElementById(survey_email).value;
    var regVyraz = /^([a-zA-Z0-9])+([\.a-zA-Z0-9_-])*@([a-zA-Z0-9])+(\.[a-zA-Z0-9_-]+)+$/;
    if (!regVyraz.test(co)) {
        alert("E-mail nebyl zadán ve správném tvaru.");
        return false;
    }
    else
        return true;
}

function kontrola() {
    var co = document.getElementById('email').value;
    var regVyraz = /^([a-zA-Z0-9])+([\.a-zA-Z0-9_-])*@([a-zA-Z0-9])+(\.[a-zA-Z0-9_-]+)+$/;
    var kam = document.getElementById('mail');
    var text = "Nesprávný formát";
    var kde = "warn";
    if (regVyraz.test(co)) {
        if (document.getElementById(kde) != null) {
            kam.removeChild(document.getElementById(kde));
        }
    }
    else {
        if (document.getElementById(kde) == null) {
            var newSpan = document.createElement('span');
            newSpan.setAttribute("id",kde);
            newSpan.appendChild(document.createTextNode(text));
            kam.appendChild(newSpan);
        }
    }
}