Remove the background from the LI and give it to the SPAN.
Code:
ul#sections li#who a span {
background: url("../_img/AboutBox_image.png")top left no-repeat;
position: absolute;
width: 100%;
height: 100%;
top: 0;
left: 0;
}
then (untested but close if not) :
Code:
jQuery('ul#sections li#who a').hover(function() {
jQuery('span', this).stop().animate({
top : '-182px'
}, {queue:false,duration:600,easing:'easeInOutQuint'});
}, function(){
jQuery('span', this).stop().animate({
top : '0px'
}, {queue:false,duration:850});
});