var req = false;
function locatetribe()// r is the report number
{
	var url = "calcdistance.cfm?tb=1&zip="+document.getElementById("zip").value+"&dis="+document.getElementById("distance").value;
	
	if (window.XMLHttpRequest)
	{
		req = new XMLHttpRequest();
		req.onreadystatechange = updatetribes;
		req.open("GET", url, true);
		req.send(null);
		// branch for IE/Windows ActiveX version
	}
	
	else if (window.ActiveXObject)
	{
		req = new ActiveXObject("Microsoft.XMLHTTP");
		if (req)
		{
			req.onreadystatechange = updatetribes;
			req.open("GET", url, true);
			req.send();
		}
	}
}

function updatetribes()
{
	if(req.readyState == 4)
	{
	  document.getElementById("triberesults").innerHTML = req.responseText;
	  /*var req = false; //must reset request variable*/
	}
}