Animation freezing in safari

Animation freezing in safari

I'm building a simple corporate site (temp on my server) for a friend's company and am having an issue with an animation I have implemented.  everything has worked fine for me (mac, firefox and safari) but my friend sent me a couple screenshots of the animation freezing on his computer (safari) when it is only halfway complete.  the two examples are:

http://julianwalter.com/fstemp/foresight/management/ (click 'Amy LeGere', then click 'next' and then 'previous' to see back and forth.  freezes halfway between the left/right movement)

http://julianwalter.com/fstemp/about-solar/technology/ (click 'Read More' at the bottom, then 'Back' at upper left.  animation freezes halfway when moving back to the original page)

I am using this code to make it happen (on a 'click'.  and the display:none is just so that the overall window doesn't remain the height of the second page when viewing the landing page):
$('#technologyScroll').animate({left:'+=1000'},250, function(){
 $('#technologyWrapper2').css('display','none');
});


same code for management page.

the code seems perfectly fine to me, and I am having no problem with any of it..  does anybody have an idea of what might be causing this?  or is nobody seeing the animation freezing?

thank you very much!