// JavaScript Document
var currentPhoto = 0;
var secondPhoto = 1;

var currentOpacity = new Array();
var imageArray=new Array();
 imageArray[0] = new Array("vernier2.jpg","multimeter2.jpg","protractor2.jpg","bulb2.jpg","magnet2.jpg","phone2.jpg","calc2.jpg","flask2.jpg","gear2.jpg");
 imageArray[1] = new Array("calc2.jpg","protractor2.jpg","vernier2.jpg");
 imageArray[2] = new Array("flask2.jpg","bulb2.jpg","calc2.jpg");
  imageArray[3] = new Array("magnet2.jpg","bulb2.jpg","flask2.jpg");

var fade_step= 2;
var fade_interval = 500;
var pause = false;
var x=0;
var fimageArray=new Array()


function init(x) {
	currentOpacity[0]=100;
	fimageArray = imageArray[x];
	for(i=1;i<fimageArray.length;i++)currentOpacity[i]=0;
	mHTML="";
	for(j=0;j<fimageArray.length;j++){mHTML+="<img src=images/" + fimageArray[j]  +" id='photo' name='photo' class='mPhoto' height='184px' width='150px' alt='Quiztorials - Revision success thru stimulating interactivity' >";}
	document.getElementById("mContainer").innerHTML = mHTML;

	if(document.all) {
		document.getElementsByName("photo")[currentPhoto].style.filter="alpha(opacity=100)";
	} else {
		document.getElementsByName("photo")[currentPhoto].style.MozOpacity = "100%";
	}

mInterval = setInterval("crossFade()",fade_interval);
document.getElementById('defnotes').style.visibility='visible';
shownotes(0);
}

function crossFade() {
	if(pause)return;

	currentOpacity[currentPhoto]-=fade_step;
	currentOpacity[secondPhoto] += fade_step;

	if(document.all) {
		document.getElementsByName("photo")[currentPhoto].style.filter = "alpha(opacity=" + currentOpacity[currentPhoto] + ")";
		document.getElementsByName("photo")[secondPhoto].style.filter = "alpha(opacity=" + currentOpacity[secondPhoto] + ")";
	} else {
		document.getElementsByName("photo")[currentPhoto].style.MozOpacity = currentOpacity[currentPhoto]/100;
		document.getElementsByName("photo")[secondPhoto].style.MozOpacity =currentOpacity[secondPhoto]/100;
	}

	if(currentOpacity[currentPhoto]<=0) {
		currentPhoto = secondPhoto;
		secondPhoto++;
		if(secondPhoto == fimageArray.length)secondPhoto=0;
		pause = true;
		xInterval = setTimeout("pause=false",2000);
	}
}

function doPause()  {
	if(pause) {
		pause = false;
		document.getElementById("pauseBtn").value = "pause";
	} else {
		pause = true;
		document.getElementById("pauseBtn").value = "play";
	}
} 
function shownotes(n)
{ 
for(var i=0;i<14;i++){document.getElementById('notes'+i).style.visibility='hidden';}
document.getElementById('defnotes').style.visibility='hidden';
document.getElementById('notes'+n).style.visibility='visible';
}
var n=0;

function hidenotes(n)
{
document.getElementById('notes0').style.visibility='visible';
document.getElementById('defnotes').style.visibility='hidden';
document.getElementById('notes'+n).style.visibility='hidden';
}
var d;
function changecd(d)
{
var wcd;
switch (d){
	case 1: wcd='chem1';
	break;
	case 2: wcd='maths1';
	break;
	case 3: wcd='maths2';
	break;
	case 4: wcd='maths3';
	break;
	case 5: wcd='sci';
	break;
	default:
	wcd='cd-group';
	}
document.getElementById('cdpic').src='headers/'+wcd+'.jpg';
}