function submitNewsletter() {
	if ( document.newsletterForm.email.value == '' ) {
		alert('Παρακαλώ συμπληρώστε το email σας!');
		return false;
	}
	var url = 'newsletter.php?email=' + document.newsletterForm.email.value;
	document.getElementById('newsletterForm').innerHTML='<img src="images/loader.gif"><br /><br />Παρακαλώ περιμένετε... ';
	var xmlHttp = createAjax();
	xmlHttp.onreadystatechange = function() {
		if ( xmlHttp.readyState == 4 ) {
			document.getElementById('newsletterForm').innerHTML=xmlHttp.responseText;
		}
	}
	getAjax(xmlHttp,url);
}	
	
function getAjax(xmlHttp,url,parameters) {
	xmlHttp.open("GET",url,true);
	xmlHttp.send(null);
}

function createAjax() {
	var xmlHttp;
	try {
	  xmlHttp=new XMLHttpRequest();
	}
	catch (e) {
		try {
			xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch (e) {
			try {
				xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
			}
			catch (e) {
				alert("Your browser does not support AJAX!");
				return false;
			}
		}
	}
	return xmlHttp;
}