var newsletter = {
	             
	    valid : function(zapiszsie)
	    {
			var form = document.getElementById('newsletter_form');
			var newsletter_message = document.getElementById('newsletter_message');
			var newsletter_email_format = document.getElementById('newsletter_email_format');
			var newsletter_email_empty = document.getElementById('newsletter_email_empty');
			
			var email = document.getElementById('newsletter_email');
			
			var error = false;
			
			newsletter_message.className = "invisible";
			newsletter_email_format.className = "invisible";
			newsletter_email_empty.className = "invisible";
			
			if(email.value)
			{     
			   var str = email.value;
			   if((str.lastIndexOf(".") > 2) && (str.indexOf("@") > 0) && (str.lastIndexOf(".") > (str.indexOf("@")+1)) && (str.indexOf("@") == str.lastIndexOf("@"))) {
			   } else {
			   newsletter_email_format.className = "visible";
			   error = true;
			   }
			} else {
			   newsletter_email_empty.className = "visible";
			   error = true;
			}
	
			if(error)
			{
					       
			}
			else {
			   form.submit();
			}
	    }  
    }