var dom = true;
if (!document.getElementById) dom = false;
if (!document.getElementById && document.all) {document.getElementById = document.all; dom = true;}
isIE = (document.all && !window.opera) ? true:false;
function objekt(what) {return document.getElementById(what);}

window.onload = init;

// kontrola emailu
function isEmail(mail) {
    re = /^[_a-zA-Z0-9\.\-]+@[_a-zA-Z0-9\.\-]+\.[a-zA-Z]{2,7}$/;
    return mail.search(re) == 0;
}

//odeslani newsletteru
function checkNewsletter(form) {
if (!isEmail(form.newsadress.value)) {
		alert("Prosím, zkontrolujte správnost zadaného emailu.");
		form.newsadress.focus();
		return false
		}
		else return true;
}