function update(urlstring, containerid){
	if(window.XMLHttpRequest) {
		// mozilla
		var url = new XMLHttpRequest();
		url.onreadystatechange=function(){
			loadpage(url, containerid)
		}
		url.open('GET', urlstring, true);
		url.send(null);
	} else if (window.ActiveXObject) {
		// ie
        var url = new ActiveXObject("Microsoft.XMLHTTP");
		url.onreadystatechange=function(){
			loadpage(url, containerid)
		}
		url.open('GET', urlstring, true);
		url.send();
	}
}

function loadpage(url, containerid){
	if (url.readyState == 4 && url.status==200){
		document.getElementById(containerid).innerHTML=url.responseText;
	}
}