var http_request = false;

function initAjax() {
	http_request = false;
	if (window.XMLHttpRequest) { // Mozilla, Safari,...
		http_request = new XMLHttpRequest();
		if (http_request.overrideMimeType) {
			// set type accordingly to anticipated content type
			http_request.overrideMimeType('text/html');
		}
	} else if (window.ActiveXObject) { // IE
		try {
			http_request = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try {
				http_request = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e) {}
		}
	}
}

function makePOSTRequest(url, parameters) {
	http_request.onreadystatechange = ajaxResponse;
	http_request.open('POST', url, true);
	http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	http_request.setRequestHeader("Content-length", parameters.length);
	http_request.setRequestHeader("Connection", "close");
	http_request.send(parameters);
}

function ajaxResponse() {
	if (http_request.readyState == 4) {
		if (http_request.status == 200) {
			src = http_request.responseText;
			alert(src);
		} else {
		}
	}
}

var x = 0;

function clearT(obj) {
	if (x==0 || obj.value == "Dostávať správy emailom") {
	 obj.value = "";
	 x = 1;
	}
}

function mailRequest() {
	ml = document.getElementById("mail").value;
	rgx = "^[a-zA-Z0-9._-]+@[a-zA-Z0-9_-]+\.[a-zA-Z.]{2,4}$";
	mtch = ml.match(rgx);
	if (mtch != null && mtch[0] == ml) {
		Request(ml);
	} else {
		alert("ZADAJTE SVOJ E-MAIL DO OKIENKA A STLAČTE OK");
	}
}

function Request(mail) {
	if (http_request == false) {
		initAjax();
	}
	makePOSTRequest("request_news.php","mail="+mail);

}