var xmlHttp = getXmlHttpObject();

function dataRequest(url)
{
	if (xmlHttp == null)
	{
		return;
	}

	xmlHttp.onreadystatechange = dataResponse;
	xmlHttp.open("GET", url, true);
	xmlHttp.send(null);
}

function dataResponse()
{
	if (xmlHttp.readyState == 4 || xmlHttp.readyState == "complete")
	{
		setData(xmlHttp.responseText);
	}
}

function getXmlHttpObject()
{
	var objXMLHttp = null;
	
	if (window.XMLHttpRequest)
	{
		objXMLHttp=new XMLHttpRequest();
	}
	else if (window.ActiveXObject)
	{
		objXMLHttp=new ActiveXObject("Microsoft.XMLHTTP");
	}
	
	return objXMLHttp;
}