/* The following is for image cross-fade for banner */

window.addEventListener?window.addEventListener("load",so_init,false):window.attachEvent("onload",so_init);

var d=document, imgs = new Array(), zInterval = null, current=0, pause=false;

function so_init() {
	if(!d.getElementById || !d.createElement)return;

	css = d.createElement("link");
	css.setAttribute("href","GrasPods.css");
	css.setAttribute("rel","stylesheet");
	css.setAttribute("type","text/css");
	d.getElementsByTagName("head")[0].appendChild(css);

	imgs = d.getElementById("imageContainer").getElementsByTagName("img");
	for(i=0;i<imgs.length;i++) imgs[i].xOpacity = 0;
	var firstImage = Math.floor(Math.random()*(imgs.length-1));
	if(firstImage>4) {firstImage=4}
	current = firstImage;
	imgs[firstImage].style.display = "block";
	imgs[firstImage].xOpacity = .99;
	
	setTimeout(so_xfade,4000);
}

function so_xfade() {
	cOpacity = imgs[current].xOpacity;
	nIndex = imgs[current+1]?current+1:0;

	nOpacity = imgs[nIndex].xOpacity;
	
	cOpacity-=.05; 
	nOpacity+=.05;
	
	imgs[nIndex].style.display = "block";
	imgs[current].xOpacity = cOpacity;
	imgs[nIndex].xOpacity = nOpacity;
	
	setOpacity(imgs[current]); 
	setOpacity(imgs[nIndex]);
	
	if(cOpacity<=0) {
		imgs[current].style.display = "none";
		current = nIndex;
		setTimeout(so_xfade,4000);
	} else {
		setTimeout(so_xfade,50);
	}
	
	function setOpacity(obj) {
		if(obj.xOpacity>.99) {
			obj.xOpacity = .99;
			return;
		}
		obj.style.opacity = obj.xOpacity;
		obj.style.MozOpacity = obj.xOpacity;
		obj.style.filter = "alpha(opacity=" + (obj.xOpacity*100) + ")";
	}
	
}

/* The following is for the menu */

function expand(s)
{
  var td = s;
  var d = td.getElementsByTagName("div").item(0);

  td.className = "menuHover";
  d.className = "menuHover";
}

function collapse(s)
{
  var td = s;
  var d = td.getElementsByTagName("div").item(0);

  td.className = "menuNormal";
  d.className = "menuNormal";
}

/* The following is for the alumni list */

function showdetail()
{ 
  var selectedAlum = document.getElementById('selector');
  for (var x = 0; x < selectedAlum.options.length; x++)
  {
    var unsel = selectedAlum.options[x].value;
    document.getElementById(unsel).style.display = 'none';
  }
  document.getElementById(selectedAlum.value).style.display = '';
}

function showall()
{
  for(var showallcounter = 0; showallcounter < document.getElementById('selector').options.length; showallcounter++)
  {
    var allsel = document.getElementById('selector').options[showallcounter].value;
    document.getElementById(allsel).style.display = '';
  }
}

/* This part is for the old banner. Not used any more. */

function showBanner()
{
  var bannerImage = new Array()
    bannerImage[0] = 'images/banner/banner0.jpg'
    bannerImage[1] = 'images/banner/banner1.jpg'
    bannerImage[2] = 'images/banner/banner2.jpg' 
    bannerImage[3] = 'images/banner/banner3.jpg' 
    bannerImage[4] = 'images/banner/banner4.jpg' 
    bannerImage[5] = 'images/banner/banner5.jpg' 

  var p = bannerImage.length;
/*  var preBuffer = new Array()
  for (i = 0; i < p; i++)
    {
      preBuffer[i] = new Image()
      preBuffer[i].src = bannerImage[i]
    }
*/
 var chooseImage = Math.round(Math.random()*(p-1));
  document.write('<img src="'+bannerImage[chooseImage]+'">');
}