var http_request = false;
var idBusca = "";
function carregarRequest(url, idx) 
{
	idBusca = idx;
	http_request = false;
	if (window.XMLHttpRequest) 
	{ // Mozilla, Safari,...
		http_request = new XMLHttpRequest();
		if (http_request.overrideMimeType) 
		{ http_request.overrideMimeType('text/xml'); }
	} else if (window.ActiveXObject) 
	{ // IE
			try 
			{ http_request = new ActiveXObject("Msxml2.XMLHTTP");	} 
			catch (e) 
			{
				try 
				{ http_request = new ActiveXObject("Microsoft.XMLHTTP");	} 
				catch (e) {}
			}
	}

	if (!http_request) 
	{
		alert('Giving up :( Cannot create an XMLHTTP instance');
		return false;
	}
	http_request.onreadystatechange = alertContents;
	http_request.open('GET', url, true);
	http_request.send(null);
}