var isNav4, isNav6, isIE;
var coll = "";
var styleObj = "";
var poppedMenu = "";
var poppedStripMenu = "";
var layFlag = 0;
var currentLayer = "";

// browser detection
if (parseInt(navigator.appVersion) >= 4) {
	if (navigator.appName == "Netscape" && parseInt(navigator.appVersion) == 4) {
		isNav4 = true;
	} else {
		if (navigator.appName == "Netscape" && parseInt(navigator.appVersion) > 4) {
			isNav6 = true;
			styleObj = ".style";
		} else { 
			isIE = true;
			coll = "all.";
			styleObj = ".style";
		}
	}	
}

// bugfix for Netscape 4
if (isNav4) {
	window.captureEvents(Event.RESIZE);
}

window.onresize = handleResize;

function handleResize() {
	if (isNav4) {
		location.reload();
		return false;
	}
}

// Opens main site window, while checking for MSIE 4.01 MacPPC and MSIE 4.5 MacPPC
function openWin(fileurl) {
	if (screen.width < 800) {
		alert('La risoluzione del Suo schermo e\' insufficiente; per una corretta visualizzazione di questo sito cambi la risoluzione ad almeno 800 x 600 pixel e riprovi.');
	} else {
		if (screen.width == 800) {
			if (navigator.appVersion == '4.0 (compatible; MSIE 4.01; Macintosh; U; PPC)' || navigator.appVersion == '4.0 (compatible; MSIE 4.5; Macintosh; U; PPC)') {
				win=window.open(fileurl,"ACI","toolbar=0,status=1,directories=0,scrollbars=0,location=0,resizable=0,menubar=0,width=790,height=517,left=" + screen.availLeft + ",top=" + screen.availTop);
			} else {
				win=window.open(fileurl,"ACI","toolbar=0,status=1,directories=0,scrollbars=0,location=0,resizable=0,menubar=0,width=790,height=500,left=" + screen.availLeft + ",top=" + screen.availTop);
			}
		} else {
			if (screen.width > 800) {
				location.href = fileurl;
			}
		}
	}
}

function blankWin(fileurl) {
	extWindow = window.open(fileurl,"Iscrizioni","toolbar=1,status=1,directories=1,scrollbars=1,location=1,resizable=1,menubar=1,width=400,height=200");
}

// returns valid object reference
function getObject(obj) {
	var theObj;
	if (isNav4) {
		theObj = eval("document." + obj);
	} else {
		if (isNav6) {
			theObj = eval("document.getElementById(" + "\"" + obj + "\"" + ")" + styleObj);
		} else {
			theObj = eval("document." + coll + obj + styleObj);
		}
	}
	return theObj;
}

// Various image swaps and layer management functions
function swap(num,imgname) {
	imgname.src = im[num].src;
	window.status = '';
}

function flip(obj,obj2) {
	var theObj = getObject(obj);
	var theObj2 = getObject(obj2);
	theObj.visibility = "visible";
	theObj2.visibility = "hidden";
}

function layerOn(obj) {
	var theObj = getObject(obj);
	theObj.visibility = "visible";
	window.status = '';
}

function layerOff(obj) {
	var theObj = getObject(obj);
	theObj.visibility = "hidden";
	window.status = '';
}

function popLayer(theLayer) {
	layerList = new Array ("acitext", "certext") ;
	if ((layFlag == 1) && (currentLayer == theLayer)) {
		layerOff(theLayer);
		layFlag = 0;
		currentLayer = "";
	} else {
		for (var i = 0; i < layerList.length; i++) {
			if (layerList[i] == theLayer) {
				layerOn(layerList[i]);
			} else {
				layerOff(layerList[i]);
			}
		}
		layFlag = 1;
		currentLayer = theLayer;
	}
}

//Sets page up to watch for mouse and scrolling activity. Also has error-handling facility

function initHomePopUp() {
	if (isNav4) {
		document.captureEvents(Event.MOUSEMOVE | Event.MOUSEOVER | Event.SCROLL | Event.ERROR)
	}
	document.onmousemove = checkHomePos
	document.onmouseover = hideStatus
	document.onscroll = shutMenu
	document.onerror = stopErrors
}

// Errors are handled here
function stopErrors() {
   return true
}

// Hides all messages from the status bar
function hideStatus() {
	window.status = '';
	return true;
}

// Checks mouse position when the menlay layer is visible
function checkHomePos(evt) {
	if (isNav4) {
		if (evt.pageX < 10 || evt.pageX > 260 || evt.pageY < 10 || evt.pageY > 442) {
			shutMenu();
		}
	} else {
		if (isNav6) {
			if (evt.pageX < 10 || evt.pageX > 260 || evt.pageY < 10 || evt.pageY > 442) {
				shutMenu();
			}
		} else {
			if (window.event.clientX < 10 || window.event.clientX > 260 || window.event.clientY < 10 || window.event.clientY > 442) {
				shutMenu();
			}
		}
	}
}

// Opens menu panel and strip
function openMenu(menuToPop) {
	goTop();
	if (isNav4) {
		if (top.length == 2) {
			top.riviste.document.menlay.visibility = "visible";
		} else {
			document.menlay.visibility = "visible";
		}
	} else {
		if (isNav6) {
			if (top.length == 2) {
				top.riviste.document.getElementById("menlay").style.visibility = "visible";
			} else {
				document.getElementById("menlay").style.visibility = "visible";
			}
		}  else {
			if (top.length == 2) {
				top.riviste.document.all.menlay.style.visibility = "visible";
			} else {
				document.all.menlay.style.visibility = "visible";
			}
		}
	}
}

//Closes menu panel and strip

function closeMenu(theNewPage) {
	if (isNav4) {
		if (top.length == 2) {
			top.riviste.document.menlay.visibility = "hidden";
		} else {
			document.menlay.visibility = "hidden";
		}
	} else {
		if (isNav6) {
			if (top.length == 2) {
				top.riviste.document.getElementById("menlay").style.visibility = "hidden";
			} else {
				document.getElementById("menlay").style.visibility = "hidden";
			}
		} else {
			if (top.length == 2) {
				top.riviste.document.all.menlay.style.visibility = "hidden";
			} else {
				document.all.menlay.style.visibility = "hidden";
			}
		}
	}
	if (theNewPage != null) {
		top.location.href = theNewPage;
	}
}

function shutMenu() {
	if (isNav4) {
		if (top.length == 2) {
			top.riviste.document.menlay.visibility = "hidden";
		} else {
			document.menlay.visibility = "hidden";
		}
	} else {
		if (isNav6) {
			if (top.length == 2) {
				top.riviste.document.getElementById("menlay").style.visibility = "hidden";
			} else {
				document.getElementById("menlay").style.visibility = "hidden";
			}
		} else {
			if (top.length == 2) {
				top.riviste.document.all.menlay.style.visibility = "hidden";
			} else {
				document.all.menlay.style.visibility = "hidden";
			}
		}
	}
}

function credOn() {
	win=window.open("pages/cred_01.htm","main","toolbar=0,status=0,directories=0,scrollbars=0,location=0,resizable=0 menubar=0,width=300,height=150");
}

function goTop() {
	if (navigator.appName == "Netscape") {
		top.scrollTo(0,0)
	} else {
		top.document.body.scrollTop = 0
	}
}

function nudgePage(direction, limit) {
	var lname  = location.pathname;
	lastSlash = lname.lastIndexOf("/", lname.length);
	var daPrefix = lname.substring(lastSlash+1, lastSlash+18);
	var daCounter  = lname.substring(lastSlash+18, lname.length-4);
	var bolox = new String(parseInt(daCounter) + direction);
	if (bolox > limit) {
		bolox = '1';
	} else {
		if (bolox == '0') {
			bolox = limit;
		}
	}
	var daLink = daPrefix + bolox + '.htm';
	self.location.href = daLink;
}