function isValidEmail(str) {
   return (str.indexOf(".") > 0) && (str.indexOf("@") > 0);

}

function newsletter() {

	var eml = $('newsletter_email').value;

	if(isValidEmail(eml)) {

		var pars = '&email=' + eml;
		var url = 'index.php?mod=misc&action=newsletter';
		var args = {method:'post',parameters: pars,onComplete: newsletterResp};
		var nlt = new Ajax.Request(url,args);

		$('newsletter_email').value = 'Prosze czekac';

	} else {

		alert('Blad');

	}
}

function newsletterResp(originalRequest) {

	$('newsletter_email').value = "";

	//alert(originalRequest.responseText);

	if(originalRequest.responseText == 'false') {
		alert('Ten adres jest juz w naszej bazie.');
	} else {
		alert('Adres zostal dodany do bazy');
	}
}