ajaxob = function(){
	return (window.XMLHttpRequest) ? 
	new XMLHTTPRequest() : 	
	new ActiveXobject('Microsoft.XMLHTTP') }

callserver = function(url, box, f,loadmsg){
	var loadmsg = loadmsg || 'loading...';
	var ob = ajaxob();
	ob.onreadystatechange = function(){
		if(ob.readyState < 4) box.innerHTML = loadmsg;
		if(ob.readyState == 4){
			if(ob.status == 200){
				if(box) box.innerHTML = ob.responseText;
				if(f) f();
			}else
				alert('ajax problem')
		}
	}
	ob.open("GET", url, true);
	ob.send(null)
}