// JavaScript Document
// Privides Fading Image Function to the Office of Development website
// Copyright 2008 Office of Development, Old Dominion University
// Corey Wilkes '09

var Fader;
var f = 1;
var opac = 100;
var FadeIn = false;

var Pics = new Array();
	Pics[0] = "lion";
	Pics[1] = "fall";
	Pics[2] = "machine";
	Pics[3] = "Outside";
	Pics[4] = "fountain";
	Pics[5] = "graduation";
	Pics[6] = "ballons";
	Pics[7] = "diverse";
	Pics[8] = "bikes";

function PicFade() {
	//Incramental Shift
	if (FadeIn) opac+=10;
	else opac-=10;
	//Adjust Image
	SetOpacity(returnObjById('Main1'),opac);
		
	if (opac==100 || opac==0) {
		f++;
		if (f==Pics.length) f=0;
		FadeIn = !FadeIn;
		//Long Pause
		Fader = window.setTimeout(PicFade, 3000);
		//Change Picture
		if (opac==100) returnObjById('Main2').src="images/slideshow/"+Pics[f]+".jpg";
		else returnObjById('Main1').src="images/slideshow/"+Pics[f]+".jpg";
	}
	else Fader = window.setTimeout(PicFade, 100); //Short Pause
}


function SetOpacity(obj, opacity) {
  opacity = (opacity == 100)?99.999:opacity;
  
  // IE/Win
  obj.style.filter = "alpha(opacity:"+opacity+")";
  
  // Safari<1.2, Konqueror
  obj.style.KHTMLOpacity = opacity/100;
  
  // Older Mozilla and Firefox
  obj.style.MozOpacity = opacity/100;
  
  // Safari 1.2, newer Firefox and Mozilla, CSS3
  obj.style.opacity = opacity/100;
}


// Info Scroller Bar
var ind=0;

function ShowInfo(i) {
	returnObjById('div'+ind).style.display='none';
	returnObjById('div'+i).style.display='block';
	ind = i;
	if (ind==0) returnObjById('LArrow').style.visibility = 'hidden';
	else returnObjById('LArrow').style.visibility = 'visible';
	if ((ind+1)==ScrollLength) returnObjById('RArrow').style.visibility = 'hidden';
	else returnObjById('RArrow').style.visibility = 'visible';
}