// convert all characters to lowercase to simplify testing
var agt=navigator.userAgent.toLowerCase();

// *** BROWSER VERSION ***
// Note: On IE5, these return 4, so use is_ie5up to detect IE5.
var is_major = parseInt(navigator.appVersion);
var is_minor = parseFloat(navigator.appVersion);

// Note: Opera and WebTV spoof Navigator.  We do strict client detection.
// If you want to allow spoofing, take out the tests for opera and webtv.
var is_nav  = ((agt.indexOf('mozilla')!=-1) && (agt.indexOf('spoofer')==-1)
			&& (agt.indexOf('compatible') == -1) && (agt.indexOf('opera')==-1)
			&& (agt.indexOf('webtv')==-1) && (agt.indexOf('hotjava')==-1));
var is_nav2 = (is_nav && (is_major == 2));
var is_nav3 = (is_nav && (is_major == 3));
var is_nav4 = (is_nav && (is_major == 4));
var is_nav4up = (is_nav && (is_major >= 4));
var is_navonly = (is_nav && ((agt.indexOf(";nav") != -1) ||
					  (agt.indexOf("; nav") != -1)) );
var is_nav6 = (is_nav && (is_major == 5));
var is_nav6up = (is_nav && (is_major >= 5));
var is_gecko = (agt.indexOf('gecko') != -1);


var is_ie = ((agt.indexOf("msie") != -1) && (agt.indexOf("opera") == -1));
var is_ie3 = (is_ie && (is_major < 4));
var is_ie4 = (is_ie && (is_major == 4) && (agt.indexOf("msie 4")!=-1) );
var is_ie4up = (is_ie && (is_major >= 4));
var is_ie5 = (is_ie && (is_major == 4) && (agt.indexOf("msie 5.0")!=-1) );
var is_ie5_5 = (is_ie && (is_major == 4) && (agt.indexOf("msie 5.5") !=-1));
var is_ie5up = (is_ie && !is_ie3 && !is_ie4);
var is_ie5_5up =(is_ie && !is_ie3 && !is_ie4 && !is_ie5);
var is_ie6 = (is_ie && (is_major == 4) && (agt.indexOf("msie 6.")!=-1) );
var is_ie6up = (is_ie && !is_ie3 && !is_ie4 && !is_ie5 && !is_ie5_5);

// KNOWN BUG: On AOL4, returns false if IE3 is embedded browser
// or if this is the first browser window opened.  Thus the
// variables is_aol, is_aol3, and is_aol4 aren't 100% reliable.
var is_aol = (agt.indexOf("aol") != -1);
var is_aol3 = (is_aol && is_ie3);
var is_aol4 = (is_aol && is_ie4);
var is_aol5 = (agt.indexOf("aol 5") != -1);
var is_aol6 = (agt.indexOf("aol 6") != -1);

var is_opera = (agt.indexOf("opera") != -1);
var is_opera2 = (agt.indexOf("opera 2") != -1 || agt.indexOf("opera/2") != -1);
var is_opera3 = (agt.indexOf("opera 3") != -1 || agt.indexOf("opera/3") != -1);
var is_opera4 = (agt.indexOf("opera 4") != -1 || agt.indexOf("opera/4") != -1);
var is_opera5 = (agt.indexOf("opera 5") != -1 || agt.indexOf("opera/5") != -1);
var is_opera5up = (is_opera && !is_opera2 && !is_opera3 && !is_opera4);

var is_webtv = (agt.indexOf("webtv") != -1); 

var is_TVNavigator = ((agt.indexOf("navio") != -1) || (agt.indexOf("navio_aoltv") != -1)); 
var is_AOLTV = is_TVNavigator;

var is_hotjava = (agt.indexOf("hotjava") != -1);
var is_hotjava3 = (is_hotjava && (is_major == 3));
var is_hotjava3up = (is_hotjava && (is_major >= 3));

// *** JAVASCRIPT VERSION CHECK ***
var is_js;
if (is_nav2 || is_ie3) is_js = 1.0;
else if (is_nav3) is_js = 1.1;
else if (is_opera5up) is_js = 1.3;
else if (is_opera) is_js = 1.1;
else if ((is_nav4 && (is_minor <= 4.05)) || is_ie4) is_js = 1.2;
else if ((is_nav4 && (is_minor > 4.05)) || is_ie5) is_js = 1.3;
else if (is_hotjava3up) is_js = 1.4;
else if (is_nav6 || is_gecko) is_js = 1.5;
// NOTE: In the future, update this code when newer versions of JS
// are released. For now, we try to provide some upward compatibility
// so that future versions of Nav and IE will show they are at
// *least* JS 1.x capable. Always check for JS version compatibility
// with > or >=.
else if (is_nav6up) is_js = 1.5;
// NOTE: ie5up on mac is 1.4
else if (is_ie5up) is_js = 1.3

// HACK: no idea for other browsers; always check for JS version with > or >=
else is_js = 0.0;

// *** PLATFORM ***
var is_win   = ( (agt.indexOf("win")!=-1) || (agt.indexOf("16bit")!=-1) );
// NOTE: On Opera 3.0, the userAgent string includes "Windows 95/NT4" on all
//		Win32, so you can't distinguish between Win95 and WinNT.
var is_win95 = ((agt.indexOf("win95")!=-1) || (agt.indexOf("windows 95")!=-1));

// is this a 16 bit compiled version?
var is_win16 = ((agt.indexOf("win16")!=-1) || 
		   (agt.indexOf("16bit")!=-1) || (agt.indexOf("windows 3.1")!=-1) || 
		   (agt.indexOf("windows 16-bit")!=-1) );  

var is_win31 = ((agt.indexOf("windows 3.1")!=-1) || (agt.indexOf("win16")!=-1) ||
					(agt.indexOf("windows 16-bit")!=-1));

var is_winme = ((agt.indexOf("win 9x 4.90")!=-1));
var is_win2k = ((agt.indexOf("windows nt 5.0")!=-1));

// NOTE: Reliable detection of Win98 may not be possible. It appears that:
//	   - On Nav 4.x and before you'll get plain "Windows" in userAgent.
//	   - On Mercury client, the 32-bit version will return "Win98", but
//		 the 16-bit version running on Win98 will still return "Win95".
var is_win98 = ((agt.indexOf("win98")!=-1) || (agt.indexOf("windows 98")!=-1));
var is_winnt = ((agt.indexOf("winnt")!=-1) || (agt.indexOf("windows nt")!=-1));
var is_win32 = (is_win95 || is_winnt || is_win98 || 
			   ((is_major >= 4) && (navigator.platform == "Win32")) ||
			   (agt.indexOf("win32")!=-1) || (agt.indexOf("32bit")!=-1));

var is_os2   = ((agt.indexOf("os/2")!=-1) || 
				(navigator.appVersion.indexOf("OS/2")!=-1) ||   
				(agt.indexOf("ibm-webexplorer")!=-1));

var is_mac	= (agt.indexOf("mac")!=-1);
// hack ie5 js version for mac
if (is_mac && is_ie5up) is_js = 1.4;
var is_mac68k = (is_mac && ((agt.indexOf("68k")!=-1) || 
						   (agt.indexOf("68000")!=-1)));
var is_macppc = (is_mac && ((agt.indexOf("ppc")!=-1) || 
							(agt.indexOf("powerpc")!=-1)));

var is_sun   = (agt.indexOf("sunos")!=-1);
var is_sun4  = (agt.indexOf("sunos 4")!=-1);
var is_sun5  = (agt.indexOf("sunos 5")!=-1);
var is_suni86= (is_sun && (agt.indexOf("i86")!=-1));
var is_irix  = (agt.indexOf("irix") !=-1);	// SGI
var is_irix5 = (agt.indexOf("irix 5") !=-1);
var is_irix6 = ((agt.indexOf("irix 6") !=-1) || (agt.indexOf("irix6") !=-1));
var is_hpux  = (agt.indexOf("hp-ux")!=-1);
var is_hpux9 = (is_hpux && (agt.indexOf("09.")!=-1));
var is_hpux10= (is_hpux && (agt.indexOf("10.")!=-1));
var is_aix   = (agt.indexOf("aix") !=-1);	  // IBM
var is_aix1  = (agt.indexOf("aix 1") !=-1);	
var is_aix2  = (agt.indexOf("aix 2") !=-1);	
var is_aix3  = (agt.indexOf("aix 3") !=-1);	
var is_aix4  = (agt.indexOf("aix 4") !=-1);	
var is_linux = (agt.indexOf("inux")!=-1);
var is_sco   = (agt.indexOf("sco")!=-1) || (agt.indexOf("unix_sv")!=-1);
var is_unixware = (agt.indexOf("unix_system_v")!=-1); 
var is_mpras	= (agt.indexOf("ncr")!=-1); 
var is_reliant  = (agt.indexOf("reliantunix")!=-1);
var is_dec   = ((agt.indexOf("dec")!=-1) || (agt.indexOf("osf1")!=-1) || 
	   (agt.indexOf("dec_alpha")!=-1) || (agt.indexOf("alphaserver")!=-1) || 
	   (agt.indexOf("ultrix")!=-1) || (agt.indexOf("alphastation")!=-1)); 
var is_sinix = (agt.indexOf("sinix")!=-1);
var is_freebsd = (agt.indexOf("freebsd")!=-1);
var is_bsd = (agt.indexOf("bsd")!=-1);
var is_unix  = ((agt.indexOf("x11")!=-1) || is_sun || is_irix || is_hpux || 
			 is_sco ||is_unixware || is_mpras || is_reliant || 
			 is_dec || is_sinix || is_aix || is_linux || is_bsd || is_freebsd);

var is_vms   = ((agt.indexOf("vax")!=-1) || (agt.indexOf("openvms")!=-1));

/// Set global values.
var timeoutNextCheck = 7000;
var photoIndex = 0;
var nextPhoto = 0;

//var disableJavaScripts = ((!is_ie && is_major < 5) || (is_ie && !is_ie5up))
var disableJavaScripts = false;
// This function is invoked by the browser on page load.
function fadeimg()
{
	var scriptName = 'start';
	if (disableJavaScripts) return;

	// we're not gonna be loaded in frames
	// if ( top.frames.length ) top.location.href = self.location.href;

	// if this is the start page, start rotating images.
	if (scriptName == "start" || scriptName == "default" )
	{ 
		NextPhoto(); 
	}
	return true;	
}

// display the next photo.
function NextPhoto()
{
	if (disableJavaScripts) return;

	photoIndex++;
	imgsrc = "";

	if (document.getElementById("immref") == null) return;
	if (document.getElementById("immref").value == "") return;
	list = document.getElementById("immref").value.split(",");
	catpag = document.getElementById("pagina").value.split(",");
	
	image = document.getElementById("imgref");
	next = document.getElementById("imgnext");
	link = document.getElementById("lnkref");
	
	if (photoIndex > list.length-1) 
	{
		photoIndex = 0;
		timeoutNextCheck = 5000;
	}
	
	codeNumber = list[photoIndex];
	numpag = catpag[photoIndex];
	
	imgsrc = codeNumber;

	// remove all existing frames from thumbnails.
	for (i=0; i<list.length; i++)
	{
		thumb = document.getElementById("ref"+list[i]);
		thumb.className = "noframe";
	}

	// add frame to current thumbnail.
	thumb = document.getElementById("ref" + codeNumber);
	// thumb.className = "frame";

	// if browser is IE5 and up, use filters.
	if (is_ie5up)
	{
		image.style.filter = "progid:DXImageTransform.Microsoft.Fade(duration=1)";
		image.filters[0].Apply()
		image.filters[0].Play();
	}

	// change the image.
	image.width = 400;
	image.src = imgsrc;

	rifimm = numpag;
	if (rifimm != '') {
		if (!isNaN(rifimm)) {
			if (strs=='') {
				link.href = 'catalogo/dettaglio_imm.asp?rif_imm=' + rifimm + '&dett=y';
			}else{
				link.href = 'dettaglio_imm.asp?rif_imm=' + rifimm + '&dett=y';
			}
			link.target = '_self';
		}
	}

	//link.href = 'javascript:dettaglio(' + numpag + ');';

	alt = thumb.alt;
	pos = alt.indexOf(";");
	propRif = document.getElementById("riferimento")
	propLoc = document.getElementById("localita")

	propRif.innerHTML = alt.substring(0,pos);
	propLoc.innerHTML = alt.substring(pos+3);

	// download the next photo also.
	nextPhoto = photoIndex + 1;
	if (nextPhoto > list.length-1) nextPhoto = 0;
	nextSrc = list[nextPhoto];
	next.src = nextSrc;

	// ensure we are invoked again.
	setTimeout ("NextPhoto()", timeoutNextCheck);
}