function fncAjax(pStrURL, pStrFunction) {
	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('Erro na atualização dos dados. Tente mais tarde.');
        return false;
    }    	
    http_request.open('GET', pStrURL, true);
    //http_request.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=iso-8859-1");
    //http_request.setRequestHeader("Cache-Control", "no-store, no-cache, must-revalidate");
    //http_request.setRequestHeader("Cache-Control", "post-check=0, pre-check=0");
    //http_request.setRequestHeader("Pragma", "no-cache");
	http_request.onreadystatechange = eval(pStrFunction);
    http_request.send(null);
}