var InternetExplorer = navigator.appName.indexOf("Microsoft") != -1;

var DEF_ITEM = 0;
var DEF_GROUP = 0;

var ID_GROUP = DEF_GROUP;
var passed = location.search ? unescape(location.search.substring(1)) + '&' : '';
var ID_ITEM = passed ? passed.substring(0, passed.indexOf('&')) : DEF_ITEM;

function TGroup(title, path) {
	this.title = title;
	this.path = path;
}

function TItem(title, filename) {
	this.title = title;
	this.filename = filename;
}

var AGROUP = new Array();
var AITEM = new Array;
AGROUP[0]=new TGroup("photographs","photographs");
AITEM[0] = new Array;
AITEM[0][0]=new TItem("1","2.jpg");
AITEM[0][1]=new TItem("2","3.jpg");
AITEM[0][2]=new TItem("3","4.jpg");
AITEM[0][3]=new TItem("4","5.jpg");
AITEM[0][4]=new TItem("5","6.jpg");
AITEM[0][5]=new TItem("6","7.jpg");
AITEM[0][6]=new TItem("7","9.jpg");
AITEM[0][7]=new TItem("8","14.jpg");
AITEM[0][8]=new TItem("9","15.jpg");
AITEM[0][9]=new TItem("10","16.jpg");
AITEM[0][10]=new TItem("11","21.jpg");
AITEM[0][11]=new TItem("12","22.jpg");
AITEM[0][12]=new TItem("13","23.jpg");
AITEM[0][13]=new TItem("14","24.jpg");
AITEM[0][14]=new TItem("15","25.jpg");
AITEM[0][15]=new TItem("16","26.jpg");
AITEM[0][16]=new TItem("17","27.jpg");
AITEM[0][17]=new TItem("18","28.jpg");
AITEM[0][18]=new TItem("19","29_1.jpg");
AITEM[0][19]=new TItem("20","29.jpg");
AITEM[0][20]=new TItem("21","30.jpg");
AITEM[0][21]=new TItem("22","31.jpg");
AITEM[0][22]=new TItem("23","32.jpg");
AITEM[0][23]=new TItem("24","33.jpg");
AITEM[0][24]=new TItem("25","17.jpg");

function CheckPassed() {
	document.write('current item: ' + ID_ITEM);
	document.write(', current collection: ' + ID_GROUP);
	document.write(' of ' + AGROUP.length);
	if (ID_GROUP > -1)
		document.write(', item count = ' + AITEM[ID_GROUP].length);
	document.write(', ref ' + AITEM[ID_ITEM][ID_GROUP].title);
	document.write(', path: ' + AGROUP[ID_GROUP].path);
}
function SetGroup(aGroup) {
	ID_GROUP = aGroup;
}
function PrintInfo() {
	if (ID_GROUP > -1)
		document.write(AITEM[ID_GROUP][ID_ITEM].title);	
}
function ShowPic() {
	var fn;
	if (ID_GROUP > -1) {
		var url = window.location.pathname + '?';
		var nextItem = Number(ID_ITEM) + 1;
		if (nextItem > AITEM[ID_GROUP].length-1)
			nextItem = 0;
		var urlNext = url + (nextItem);
	
		fn = AGROUP[ID_GROUP].path + '/' + AITEM[ID_GROUP][ID_ITEM].filename;
		var html = '';
		html = html + '<a href="' + urlNext + '">';
		html = html + '<img src="' + fn + '" />';
		html = html + '</a>';
		document.write(html);
	}
}