// galleryManager JavaScript Document



// set the following in each html file based on directory showing for this html file 

// var galleryPath = ".\/photos\/";		// where photos and thumbnails reside for this page

// var arrowPath = "..\/images\/";

// var pics = new Array(

//			"achilles2.jpg",

//			...

//			"lastpic.jpg );		



var currSet = 0;

var numSets = 0;

var numFrames = 0;

var thumbPath = galleryPath +  "thumbs\/";

var frames;

var arrowLeft;

var arrowRight;

var stdBrowser;

var infoDiv = null;



window.onload = function() { init(); }

//addEvent(window, "load", init);



function init() {

	// load thumb nail images into frames

	if (document.images) {		

		frames = document.getElementsByName("tiny");

		numFrames = frames.length;

		numSets = pics.length / numFrames;

		

		for (var i=0;i<numFrames;i++) {

				frames[i].src = thumbPath + pics[i];

				frames[i].onmousedown= function() {showPic(this);}

		}

		arrows = document.getElementsByName("arrow");

		if (arrows[0]) {

			arrowLeft = arrows[0];

			arrowLeft.onmousedown= function() {prevSet();}

		}

		if (arrows[1]) {

			arrowRight = arrows[1];

			arrowRight.onmousedown= function() {nextSet();}

		}

		if (infos) {

			infoDiv = document.getElementById("info");

		}	

	} else {

		alert("No document.images supported");

	}

}



function showPic(obj) {

	for (var i = 0; i <= numFrames; i++) {

		if (obj == frames[i]) break;

	}

	

	frameNum = i;

	var realNum = (currSet * numFrames) + frameNum;

	document.bigPic.src = galleryPath + pics[realNum];

	if (infoDiv) {

		infoDiv.innerHTML = infos[realNum];

	}

}



function nextSet() {

	if (++currSet == numSets) {

			--currSet;

	} else {

		var offSet = currSet * frames.length;

		for (var i=0;i<frames.length;i++) {

				frames[i].src = thumbPath + pics[i + offSet];

		}

		if (currSet == (numSets - 1)) {

				arrowRight.src = arrowPath + "arrowEmpty.gif";	

		}		

		arrowLeft.src = arrowPath + "arrowLeft.gif";	

	}

}



function prevSet() {

	if (--currSet < 0) {

			++currSet;

	} else {

		var offSet = currSet * frames.length;

		for (var i=0;i<frames.length;i++) {

				frames[i].src = thumbPath + pics[i + offSet];

		}

		if (currSet == 0) {

				arrowLeft.src = arrowPath + "arrowEmpty.gif";	

		}			

		arrowRight.src = arrowPath + "arrowRight.gif";	

	}

}



//==============================================================================

// utility functions below...

//==============================================================================



// adds an eventListener for browsers which support it.

/*** not good for MAC ??? function addEvent(obj, evType, fn){

   if (obj.addEventListener){  

    obj.addEventListener(evType, fn, true);

    return true;

  } else if (obj.attachEvent){

	var r = obj.attachEvent("on"+evType, fn);

    return r;

  } else {

	alert("Can't add event " + evType + " for " + obj);

	return false;

  }

}

****/