var httpRequest = false;

String.prototype.trim = function() {
	return this.replace(/^\s+|\s+$/g,"");
}
String.prototype.ltrim = function() {
	return this.replace(/^\s+/,"");
}
String.prototype.rtrim = function() {
	return this.replace(/\s+$/,"");
}
String.prototype.killtags = function() {
 	return this.replace(/<\/?[^>]+(>|$)/g,"");
}

function ajax_add_newsletter() {

	var params = 	"_fname=" + encodeURI( $("_fname").value ) +
					"&_lname=" + encodeURI( $("_lname").value ) +
					"&_email=" + encodeURI( $("_email").value ) +
					"&v_email=" + encodeURI( $("v_email").value ) +
					"&group=" + encodeURI( $("group").value );
	var url = "ajax/a_add_newsletter.php";
	var mime = "application/json";
	
	if (window.XMLHttpRequest) {
		httpRequest = new XMLHttpRequest();
		if (httpRequest.overrideMimeType) {
			// set mime type accordingly
			httpRequest.overrideMimeType(mime);
		}
	}
	else if (window.ActiveXObject) { // IE
		try {
			httpRequest = new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch (e) {
			try {
				httpRequest = new ActiveXObject("Microsoft.XMLHTTP");
			}
			catch (e) {}
		}
	}
	if (!httpRequest) {
		alert('Create XMLHTTPRequest failed.');
		return false;
	}
	
	httpRequest.open('POST', url, true);
	httpRequest.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	
	httpRequest.onreadystatechange = function() {
		if (httpRequest.readyState == 4) {
			if (httpRequest.status == 200) {
				if(httpRequest.responseText != "NULL") {
					resp = httpRequest.responseText.killtags().trim();
					if(resp.substr(0,5) != "Thank") {
						$("description_text").set('text',resp);
					}
					else {
						$("news_content").empty().set('text',resp);
					}
				}
			}
		}
	};
	
	httpRequest.send(params);
	return true;
}