Conveyor Belt wont show in IE6 or IE8

[mikegw]

I installed DD Conveyor Belt script and it works fine in FF but does not show up at all in IE6 or IE8. It just a blank white space were the belt should be.

my site is www.canyonawards.com.

The link to the script is below
http://www.dynamicdrive.com/dynamicindex14/leftrightslide.htm

Thanks