function create_rq()
{
	var br_ie = "Microsoft Internet Explorer" == navigator.appName;
	return br_ie ? new ActiveXObject("Microsoft.XMLHTTP") : new XMLHttpRequest();
}

var http_req;
var req_callback;

function snd_req(req, callb)
{
	req_callback= callb;
	http_req= create_rq();
	http_req.open('get', req);
	http_req.onreadystatechange= req_int_callb;
	http_req.send(null);
}
function req_int_callb()
{
	if (4 == http_req.readyState) {
		var response= http_req.responseText;
		var update= new Array();

//		if(0 == response.indexOf('OK')) {
			req_callback(response);
//		}
	}
}
function req_empty_callback(req)
{
	// nothing.
	return true;
}
function opacidad(obj, num)
{
	obj.style.opacity= num;
	obj.style.filter = 'alpha(opacity=' + (num * 100) + ')';
}