function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}

// boolean to limit movement
var isMoving = false;

//
// swapImg()
// Function runs on window load, going through link tags looking for rel="preview".
// These links receive onmouseover events that enable the preview display for their targets.
//
function swapImg(theLink) 
{
	var img = theLink.href;
	var imgtext = theLink.title;
	
	// stop if we've already loaded that image
	if ($("detailImg").src == theLink.href)
		return;
	// stop if we're already animating.	
	if (isMoving)
		return;
	
	// hilight the thumbnail	
	Element.addClassName(theLink, "active");
	
	// remove the hilight from the previous thumbnail
	var anchors = document.getElementsByTagName("a");
	for (var i=0; i<anchors.length; i++){
		var anchor = anchors[i];

		if (anchor.getAttribute("href") && (anchor.getAttribute("rel") == "preview" && anchor !== theLink)){
			Element.removeClassName(anchor, "active");
		}
	}
	
	isMoving = true;	
	
	imgPreload = new Image();
	// Fade out the current image
	Effect.Fade('detailImg', {duration: .5, afterFinish: function() {imgPreload.src=img;}});
	// Preload the next image
	imgPreload.onload = function() {
		// Swap the image into place
		$("detailImg").src = img;
		$("detailImg").alt = imgtext;
		// Now fade it in
		Effect.Appear('detailImg', {duration: .5, afterFinish: function() {isMoving=false;}});
 	}
}

//
// initPreview()
// Function runs on window load, going through link tags looking for rel="preview".
// These links receive onmouseover events that enable the preview display for their targets.
//
function initPreview()
{	
	if (!document.getElementsByTagName){ return; }
	var anchors = document.getElementsByTagName("a");

	// loop through all anchor tags
	for (var i=0; i<anchors.length; i++){
		var anchor = anchors[i];

		if (anchor.getAttribute("href") && (anchor.getAttribute("rel") == "preview")){
			anchor.onmouseover= function () {swapImg(this); return false;}
			anchor.onclick= function () {return false;}
		}
	}
}

//
// addLoadEvent()
// Adds event to window.onload without overwriting currently assigned onload functions.
// Function found at Simon Willison's weblog - http://simon.incutio.com/
//
function addLoadEvent(func)
{	
	var oldonload = window.onload;
	if (typeof window.onload != 'function'){
    	window.onload = func;
	} else {
		window.onload = function(){
		oldonload();
		func();
		}
	}

}

// run initPreview onLoad
addLoadEvent(initPreview);