var xmlHttp

function showHint(str){
	xmlHttp=GetXmlHttpObject()
	if (xmlHttp==null){
		alert ("Your browser does not support AJAX!");
		return;
	} 
	var url="lastupload.php";
	xmlHttp.onreadystatechange=stateChanged;
	xmlHttp.open("GET",url,true);
	xmlHttp.send(null);
}

function stateChanged(){ 
	if (xmlHttp.readyState==4){ document.getElementById("txtHint").innerHTML=xmlHttp.responseText;}
}

function GetXmlHttpObject(){
	var xmlHttp=null;
	try{xmlHttp=new XMLHttpRequest();}// Firefox, Opera 8.0+, Safari
	catch (e){
		try{xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");}
		catch (e){xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");}
	}  // Internet Explorer
	return xmlHttp;
}