function eseguiRichiesta(url,text_field) {


        var http_request = false;

        if (window.XMLHttpRequest) { // Mozilla, Safari,...
            http_request = new XMLHttpRequest();
            if (http_request.overrideMimeType) {
                http_request.overrideMimeType('text/xml');
                // Vedi note sotto
            }
        } 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) {
            return false;
        }
        http_request.onreadystatechange = function() { alertContents(http_request,text_field); };
        http_request.open('GET', url, true);
        http_request.send(null);

    }




function alertContents(http_request,text_field1)
{
	var textstamp;
	if (http_request.readyState == 4)
	{
		if (http_request.status == 200)
		{
			textstamp=http_request.responseText;
			if (textstamp.substr(0, 17)=="<!-- verifica -->")
			{				
				var R = document.getElementById(text_field1);
				R.innerHTML = textstamp;		
			}
			else
			{
				if (text_field1=='news_paginemediche')
				{
					var R = document.getElementById(text_field1);
					R.innerHTML = "<br><br><center>Servizio momentaneamente<br>non disponibile</center>";
				}
			}
		}
		else
		{
			if (text_field1=='news_paginemediche')
			{
				var R = document.getElementById(text_field1);
				R.innerHTML = "<br><br><center>Servizio momentaneamente<br>non disponibile</center>";
			}
		}
	}
}