function Ajax(){
	var xmlhttp=false;
	try {
		xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
	} catch (e) {
		try {
		   xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
		} catch (E) {
			xmlhttp = false;
  		}
	}

	if (!xmlhttp && typeof XMLHttpRequest!='undefined') {
		xmlhttp = new XMLHttpRequest();
	}
	return xmlhttp;
}

function newsletter(){
	var ajax = new Array();
	ajax[0] = Ajax();
	var email = document.getElementById('emailnews').value;
	
	ajax[0].open("GET", "inc/newsletter.php?email="+ email + "&nocache=" + Math.random());
	ajax[0].onreadystatechange=function() {
		if (ajax[0].readystate==1) {
			document.getElementById('capanews').innerHTML = 'comprobando datos...';
		}
		if (ajax[0].readyState==4) {
			var resp = ajax[0].responseText.split('---');
			document.getElementById('capanews').innerHTML = resp[0];
			if(resp[1] == 'bien') {
				document.getElementById('emailnews').disabled='disabled';
				document.getElementById('submitnews').disabled='disabled';
			}
		}
	}
	ajax[0].send(null)
}