var http_request = null;

function ajaxSubmit(url, parameters, response) {
	http_request = false;
	
	if (window.XMLHttpRequest) {
		http_request = new XMLHttpRequest();
		if (http_request.overrideMimeType) {
			//http_request.overrideMimeType('text/xml');
			http_request.overrideMimeType('text/html');
		};
	} else if (window.ActiveXObject) {
		try {
			http_request = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try {
				http_request = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e) { };
		};
	};
	
	if (!http_request) {
		alert('Cannot create XMLHTTP instance');
		return false;
	};
	
	http_request.onreadystatechange = response;
	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);
};