Tweak Simple Javascript (A Few Lines) To Work In IE 8 - repost

Hello...in the attached HTML document there are 2 Javascript things happening. 1. When the jwplayer video gets to a certain amount of seconds in, a countdown timer appears. When the timer gets to "0" it disappears. 2. Then, later in the vide, when it gets to a certain amount of seconds played, an "add to cart button" appears. All of this works perfectly in IE9, Firefox...but neither of these work in IE 8. If we change the security settings in IE 8 from Medium-High to just Medium, the COUNTDOWN timer works...but the add to cart button popping up still does not. We want both of these to work perfectly in the "out of hte box" security settings of IE 8. Thanks! Dan