Icy Phoenix

My website is this in Hallowen and i design a style for this month check: www.kokforos.com/foro

I apply the efect chirismas to bat's

http://www.kokforos.com/foro/images/xmas/snfl_01.gif

But the problem is that in my site the bat's leave in an inferior size to which designs, as I can change it to the real size.

Thanks