IE error in lightbox.js Expected ‘}’

I have installed the Lightbox 2 plugin for displaying my images. And it works perfect.

But even though it works flawless in all browsers (IE, Opera, Chrome, FF and Safari) I get this error-message in IE and I′ve searched the web for 2 days now, trying to solve the problem.

Webpage error details

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 1.1.4322)
Timestamp: Fri, 30 Apr 2010 14:07:54 UTC

Message: Expected ‘}’
Line: 50
Char: 56
Code: 0
URI: https://vassingdesign.dk/wordpress/wp-content/themes/wp-creativix/js/lightbox.js

Maybe I think, that it has something to do with the escape-sequence, that IE doesnt understand or something.

Here is the code from the lightbox.js-file

//
//  Configurationl
//
LightboxOptions = Object.extend({
    //fileLoadingImage:        '/wp-content/themes/wp-creativix/images/loading.gif',
   	fileLoadingImage : '../images/lightbox/loading.gif';
    //fileBottomNavCloseImage: '/wp-content/themes/wp-creativix/images/closelabel.gif',
  	fileBottomNavCloseImage : '../images/lightbox/closelabel.gif';

    overlayOpacity: 0.8,   // controls transparency of shadow overlay

    animate: true,         // toggles resizing animations
    resizeSpeed: 7,        // controls the speed of the image resizing animations (1=slowest and 10=fastest)

    borderSize: 10,         //if you adjust the padding in the CSS, you will need to update this variable

	// When grouping images this is used to write: Image # of #.
	// Change it for non-english localization
	labelImage: "Image",
	labelOf: "of"
}, window.LightboxOptions || {});

Line number 50 is:

fileLoadingImage : '../images/lightbox/loading.gif';

And I have tried with

fileLoadingImage : '../images/lightbox/loading.gif',

But then half the screen just turn black. ??

Really hope you can help.