var xmlHttp = new XMLHttpRequest();

/*function createRequestObject()
{
	var request_;
	var browser = navigator.appName;

	if(browser == "Microsoft Internet Explorer")
	{
		request_ = new ActiveXObject("Microsoft.XMLHTTP");
	}

	else request_ = new XMLHttpRequest();

	return request_;
}*/

function getInfo()
{
	xmlHttp.open('get','hxdropdown.php?hbrandid='+ document.ins_mm.hbrandid.selectedIndex);
	xmlHttp.onreadystatechange = handleInfo;
	xmlHttp.send(null);
}

function handleInfo()
{
	if(xmlHttp.readyState == 1)
	{
		document.getElementById('main').innerHTML = 'loading ..';
	}

	else if(xmlHttp.readyState == 4)
	{
		var response = xmlHttp.responseText;
		document.getElementById('main').innerHTML = response;
	}
}