[Plugin: Infinite-Scroll] Infinite Scroll and JQuery -functions..

So here’s the problem:
I got a jQuery function like this in my footer.php which applies a hover-effect to every post.

<script type="text/javascript" charset="utf-8">
			(function($) {
				$('.post_wrapper').mouseenter(function() {
					$(this).parent().find('.contenthover').animate({
						height:'toggle'
					}, 400, function(){
					});
				});
				$('.post_wrapper').mouseleave(function() {
					$(this).parent().find('.contenthover').animate({
						height:'toggle'
					}, 400, function(){
					});
				});
			})(jQuery);
</script>

And this works just fine for me when the page loads, but i don’t know how to get the same effect to the posts that infinite scroll loads. I’m quite new to jquery and wordpress, so i would appreciate a answer that tells me in which file i need to put which code.

I’ve tried this:
I put the same code to “Javascript to be called after the next posts are fetched” -field and it did the effect but it did it twice

http://ww.wp.xz.cn/extend/plugins/infinite-scroll/