Your IE 6 probably is a standalone version without filters. This breaks the script.
To fix it:
Code:
// -------------------------------------------------------------------
// Image Thumbnail Viewer II- By Dynamic Drive, available at: http://www.dynamicdrive.com
// Last updated: Feb 5th, 2007
// -------------------------------------------------------------------
var thumbnailviewer2={
enableTitle: true, //Should "title" attribute of link be used as description?
enableTransition: false, //Enable fading transition in IE?
hideimgmouseout: false, //Hide enlarged image when mouse moves out of anchor link? (if enlarged image is hyperlinked, always set to false!)
/////////////No need to edit beyond here/////////////////////////
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