/* ARGOMENTI:
1) nome della pagina contenente codice adserver su http://www.html.it/ads_pages/
2) durata del cookie  (in minuti). se impostata a "0" vale per una sessione
*/

/* parte da aggiungere alla pagina nel BODY:
<!-- INTERSTITIAL START -->
<script type="text/javascript" src="http://utenti.html.it/common/js/interstitial.js"></script>
<script type="text/javascript">
var subdom_inc = 'n';
show_interstitial('interstitial_webnews.php','15');
</script>
<!-- INTERSTITIAL END -->
*/

///////////////////////////
/* INIZIO CONFIGURAZIONE */
///////////////////////////
var back_url = escape( window.location );
var p_alldomain = p_alldomain ? p_alldomain : 'n';
var p_urlpage = p_urlpage ? p_urlpage : 'http://www.html.it/ads_pages/';
//array dei siti con sottodominio per cui deve valere il cookie
site_cookname = new Array();
site_cookname.push( 'webnews.it' );
site_cookname.push( 'pmi.it' );
function show_interstitial(mypage,cook_time)
{
	var queryStringTokens = window.location.search.split('?').pop().split('&');

	for( var i = 0, l = queryStringTokens.length; i < l; i++ )
	{
		if( queryStringTokens[ i ].toLowerCase() == 'preview=true' )
		{
			return false;
		}
	}

	//controllo se il browser accetta i cookie
	checkCookie_interstitial();
	if (cookieenabled == false)
	{
		return false;
	}
	cook_name = window.location.hostname + '_interstitial';
	cook_domain = '';
	// vedo che parametri dare al cookie (in caso dovesse passare anche subdomain)
	if (p_alldomain == 'y')
	{
		for (i=0; i<site_cookname.length; i++)
		{
			if (window.location.hostname.indexOf(site_cookname[i]) != -1)
			{
				cook_name = site_cookname[i] + '_interstitial';
				cook_domain = site_cookname[i];
			}
		}
 	}
	//se non c'è il cookie impostato
	if ( ScanCookie_interstitial( cook_name ) == 0 )
	{
		base_domain = window.location.hostname;
		split_domain = window.location.hostname.split(".");
		if (split_domain[1] != undefined)
		{
			ref_domain = split_domain[1];
		} else {
			ref_domain = 'html.it';
		}
		CreationCookie_interstitial(cook_name,false,cook_time,cook_domain);
		if( mypage.indexOf( 'http://' ) == 0 )
		{
			top.window.location = mypage + '?backto=' + back_url + '&site=' + base_domain + '&ref=' + ref_domain;
		} else {
			top.window.location = p_urlpage + mypage + '?backto=' + back_url + '&site=' + base_domain + '&ref=' + ref_domain;
		}
	}
}

///////////////////////////////////////////////
/* FUNZIONE CONTROLLA, SCANNA E SETTA COOKIE */
///////////////////////////////////////////////
function checkCookie_interstitial()
{
	document.cookie = "testcookie_interstitial";
	cookieenabled = (document.cookie.indexOf("testcookie_interstitial") != -1) ? true : false;
	return cookieenabled;
}

function ScanCookie_interstitial(variable)
{
	cook = document.cookie;
	variable += "=";
	place = cook.indexOf(variable,0);
	end_interstitial = '';
	if (place <= -1)
	{
		return(0);
 	} else {
		end_interstitial = cook.indexOf(";",place);
		if (end_interstitial <= -1)
		{
			return(unescape(cook.substring(place+variable.length,cook.length)));
		} else {
			return(unescape(cook.substring(place+variable.length,end_interstitial)));
		}
 	}
}
function CreationCookie_interstitial(nome,valore,durata,dominio)
{
	if (dominio != '')
	{
		miodominio = "domain= " +dominio+ "; ";
	} else {
		miodominio = '';
	}
	if (durata != 0)
	{
		var calc_durata = parseInt(durata) * 60000;
		var now = new Date();
		var ex = new Date();
		var valore = escape(valore);
		ex.setTime(now.getTime() + calc_durata);
		document.cookie = nome+ "=" +valore+ " ; path=/; " +miodominio+ "expires=" +ex.toGMTString();
	} else {
		document.cookie = nome+ "=" +valore+ "; path=/; " +miodominio+ "expires=";
	}
}// fine funzioni