var id = "newsletter";

function showCode() {
	var url = "/show_code.php";
	get(url);
}

function checkCodeAjax(action, email, code) {
	var url = "/show_code.php?action="+action+"&email="+email+'&code='+code;
	get(url);	
}

function get(url) {
        if (window.XMLHttpRequest) { // Mozilla, Safari,...
            http_request = new XMLHttpRequest();
            if (http_request.overrideMimeType) {
                http_request.overrideMimeType('text/xml');
                // See note below about this line
            }
        } else if (window.ActiveXObject) { // IE
            try {
                http_request = new ActiveXObject("Msxml2.XMLHTTP");
            } catch (e) {
                try {
                    http_request = new ActiveXObject("Microsoft.XMLHTTP");
                } catch (e) {}
            }
        }

        if (!http_request) {
            //alert('Giving up :( Cannot create an XMLHTTP instance');
            return false;
        }

       http_request.onreadystatechange = function() { showContents(http_request); };
        http_request.open("GET", url, true);
        http_request.send(null);

}

function showContents(http_request) {

	   var response;
	if (http_request.readyState == 4) {
		if (http_request.status == 200) {
			response = http_request.responseText;
			document.getElementById(id).innerHTML = http_request.responseText;
		} 
	}

}