function showPage(url, containerId) {
	try {
	    xmlhttp = get_xmlhttp();
	    xmlhttp.onreadystatechange = function() {
        	if(xmlhttp.readyState == 4) {
				listTableObj = document.getElementById(containerId);
				listTableObj.innerHTML = xmlhttp.responseText;
        	}
    	}
    	send_req(xmlhttp, url);
    }
	catch(e) {
		alert(e);
	}
}