JavaScript - Help In Flipping ...

AMAZON has some nice future for book preview and they can display book cover/back like real book.
For instance
Rational Astrology: as a physical model (Chinese Edition): Julian J.-L. Ting: 9781493734559: Amazon.com: Books
Presumably that is done by javascript?
Is there any free code available for doing such business?

Hi everyone. Here is the code I am using to flip an image 3 times (Blank -> X, X-> O and O back to blank)

Code:

function flipBox(img) {
	var tmpname;
	if(img.src=="http://www.riddlesforall.com/logic/n.gif") {
		img.src = "http://www.riddlesforall.com/logic/x.gif";
		tmpname = img.name;
		document.mainform.elements[tmpname].value = 1;
		document.getElementById(img.name).value = 1;
	} else if(img.src=="http://www.riddlesforall.com/logic/x.gif") {
		var finaltest = checkDoubles(img.name);
		if(finaltest=="false") {
			img.src = "http://www.riddlesforall.com/logic/o.gif";
			tmpname = img.name;
			document.mainform.elements[tmpname].value = 3;
			document.getElementById(img.name).value = 3;		
		} else {
			img.src = "http://www.riddlesforall.com/logic/n.gif";
		}		
	} else if(img.src=="http://www.riddlesforall.com/logic/o.gif") {
		img.src = "http://www.riddlesforall.com/logic/n.gif";
		tmpname = img.name;
		document.mainform.elements[tmpname].value = 0;
		document.getElementById(img.name).value = 0;		
	}	
	showVals();
}

I had it working, previously, and everything was fine, but now, for some odd reason I cannot figure out, it is changing the names of the image files to absurdly long gibberish, and I cannot flip any images at all, clicking does nothing. Here is an example of what it changes the names to:

Code:

<img src="data:image/gif;base64,R0lGODlhGQAZAIAAAP///wAAACH5BAEAAAAALAAAAAAZABkAAAIXhI+py+0Po5y02ouz3rz7D4biSJamWAAAOw==" height=20 width=20 id=1-0-0 name=A1B1 onclick="flipBox(this);" class=gridbox>

There are 3 images - N.gif (blank) X.gif (An X) and O.gif

I do not understand why it is changing the names like this? As I said, it was working fine before, and now this.