var xmlHttp;
function showUser(x,y,f)
	{ 
	xmlHttp=GetXmlHttpObject();
	if (xmlHttp==null)
 		{
 		alert ("Browser does not support HTTP Request");
 		return;
 		}
	var url="getnatcompt.php";
	if(!f && x && y)
		{
		url=url+"?q="+x+"&z="+y;
		}
	if(!f && (!x || !y))
		{
		url=url+"?q=2000-01-01&z=2050-01-01";
		}
	if(f || (!x && !y))
		{
		url=url+"?q=2000-01-01&z=2050-01-01";	
		}
	url=url+"&sid="+Math.random();
	xmlHttp.onreadystatechange=stateChanged;
	xmlHttp.open("GET",url,true);
	xmlHttp.send(null);
	}
function stateChanged() 
	{ 
	if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
 		{ 
 		document.getElementById("txtHint").innerHTML=xmlHttp.responseText;
 		} 
	}
function GetXmlHttpObject()
	{
	var xmlHttp=null;
	try
 		{
 		// Firefox, Opera 8.0+, Safari
 		xmlHttp=new XMLHttpRequest();
 		}
	catch (e)
 		{
 		//Internet Explorer
 		try
  			{
  			xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
  			}
 		catch (e)
  			{
  			xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
  			}
 		}
	return xmlHttp;
	}