window.onerror=null;

function browserInformation() {
    this.ie = (navigator.appName.indexOf('Micr') != -1);
    this.ns = (navigator.appName.indexOf('Nets') != -1);
    this.mac = (navigator.userAgent.indexOf('Mac') != -1) || (navigator.userAgent.indexOf('mac') != -1);
    this.windows = (navigator.userAgent.indexOf('Win') != -1) || (navigator.userAgent.indexOf('win') != -1);
    this.level4 = (navigator.appVersion.charAt(0) >=  4)
}
theBrowser = new browserInformation();


function Preload() {
	if (theBrowser.ie) {
		index = this.displayed - 1;
		if (index < 0 ) { index = this.thePictureListSrc.length - 1; }
		this.preloadAtIndex(index);
	    index = this.displayed + 1;
		if (index > this.thePictureListSrc.length - 1 ) { index = 0; }
		this.preloadAtIndex(index);
	} else {
		for ( var i= 0 ; i <= this.thePictureListSrc.length - 1; i++) {
			this.preloadAtIndex(i);
		}
	}
}

//function Preload() {
//    index = this.displayed - 1;
//	if (index < 0 ) { index = this.thePictureListSrc.length - 1; }
//	this.preloadAtIndex(index);
//    index = this.displayed + 1;
//	if (index > this.thePictureListSrc.length - 1 ) { index = 0; }
//	this.preloadAtIndex(index);
//}
//function Wait(anIndex) {
//	if (this.thePictureList[anIndex].complete != true) {
//		 setTimeout(this.wait(anIndex),100);
//	}
//}


function PreloadAtIndex(anIndex) {
	if ( this.thePictureList[anIndex] == null ) {
		//index = 0
		this.thePictureList[anIndex] = new Image();
		this.thePictureList[anIndex].src = this.thePictureListSrc[anIndex].thePicture;
		//while (this.thePictureList[anIndex].complete != true || index >= 200) {
		//	this.thePictureListSrc[this.displayed].status = 'loading...';
		//	index += 1;
		//}
		//this.thePictureListSrc[this.displayed].status = 'loaded';
    }
}

function ChangeDisplayed(anIndex) {
	this.displayed = anIndex
}

function NextPicture() {
	if (this.displayed < this.thePictureListSrc.length - 1) {
		var index = this.displayed + 1
	} else {
		index = 0;
    }
	if ( this.thePictureList[index] == null ) {
		this.preloadAtIndex(index);
	}
	if ( this.thePictureList[index].complete == true ) {
	document.images.Canvas.src = this.thePictureList[index].src;

	document.images.Canvas.onLoad = this.changeDisplayed(index);
	if (theBrowser.ie) {this.preload();}
	}
}

function PreviousPicture() {
    if (this.displayed > 0) {
		var index = this.displayed - 1
    } else {
		index = this.thePictureListSrc.length - 1 ;
	}
	if ( this.thePictureList[index] == null ) {
		this.preloadAtIndex(index);
	}
	if ( this.thePictureList[index].complete == true ) {
	document.images.Canvas.src = this.thePictureList[index].src;
	document.images.Canvas.onLoad = this.changeDisplayed(index);
	if (theBrowser.ie) {this.preload();}
	}
}

function PictureObject(aName, anImage, aGallery) {
	// properties
	this.theName = aName;
	this.thePicture = anImage;
	this.theGallery = aGallery;
	this.status = null;
}

function createPicture(aName, anImage) {
	aPicture = new PictureObject(aName, anImage, this);
	var index = this.thePictureListSrc.length;
	this.thePictureListSrc[index] = aPicture;
	this.thePictureList[index] = null;
	// return aPicture;
}
		
function Gallery() {
	// properties
	this.thePictureList = new Array();
	this.thePictureListSrc = new Array();
	this.displayed = 0;
	
	// methods	
	this.newPicture = createPicture;
	this.nextPicture = NextPicture;
	this.previousPicture = PreviousPicture;
	this.preload = Preload;
	this.preloadAtIndex = PreloadAtIndex;
	this.changeDisplayed = ChangeDisplayed;
}