jquery animation

i'm carrying teenager problems animations i'm perplexing set up. i have integrate divs built tip any kind this.

<div id="div1">
   stuff...
</div>
<div id="div2">
   some-more stuff...
</div>

each divs dump shade receptive around jquery plugin (jquery.dropshadow.js).

the problem occurs i enhance divs controlling kind animation. shade does transform distance div. i redraw shade callback animation nonetheless still looks graceful joggy.

is there proceed i transform station shadows intermittently via impetus animation anyone advise improved dump shade library repair problem? doesn't have jquery plugin.