var xmlHttp;

function showList(str)
{ 
	xmlHttp = GetXmlHttpObject();
	if (xmlHttp == null)
	{
		alert ("Browser does not support HTTP Request");
		return;
	} 

	var url = "/includes/catalogDisplay.php";
	url = url + "?q=" + str;
	url = url + "&sid=" + Math.random();
	xmlHttp.open("GET",url,true);
	xmlHttp.onreadystatechange = stateChanged;
	xmlHttp.send(null);
}

function stateChanged() 
{
	if(xmlHttp.readyState!==4 || xmlHttp.readyState!=="complete") {
		document.getElementById("list").innerHTML = "loading...";
	}

	if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete") {
		document.getElementById("list").innerHTML = xmlHttp.responseText;
	}
} 

function GetXmlHttpObject()
{ 
	var objXMLHttp = null;
	
	if (window.XMLHttpRequest)
	{
		objXMLHttp = new XMLHttpRequest();
	}

	else if (window.ActiveXObject)
	{
		objXMLHttp = new ActiveXObject("Microsoft.XMLHTTP");
	}
	return objXMLHttp;
}