function addToFavorites() {  
    var title = "ATM - Akademia Technik Malarskich";
    var url = "http://atm.edu.pl";  
    if (window.sidebar) { // Firefox  
	window.sidebar.addPanel(title, url, '');
	return false;
    }
    else if(window.opera && window.print) // Opera  
    {  
	var elem = document.createElement('a');  
	elem.setAttribute('href',url);  
	elem.setAttribute('title',title);  
	elem.setAttribute('rel','sidebar'); // required to work in opera 7+  
	elem.click();
	return false;
    }   
    else if(document.all) { // IE  
	window.external.AddFavorite(url, title);
	return false;
    }
}

function isValidMail(mail) {
    return /^[a-z0-9][a-z0-9_\.\-]*@[a-z0-9\.]+\.[a-z]{2,5}$/i.test(mail);
}