function ajaxRequest()
{
	var opt = 's=whatever you want to pass';
	var page = 'ajax_page.php';

	var http = createRequestObject();
	http.onreadystatechange = function()
	{
		if((http.readyState == 4) && (http.status == 200))
		{
			var text = http.responseText;
		}
	}
	http.open('POST', page, true);
	http.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	http.setRequestHeader("Content-length", opt.length);
	http.setRequestHeader("Connection", "close");
	http.send(opt);
}