Resize Height of Object/Embed with jQuery? -

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i have object/embed on page:

<object type="application/x-shockwave-flash" width="100%" height="{$height}" id="chat_shell"         data="js/8wayrun/irc/lightirc.swf?host={$server}{$params}{$extras}{$styles}">     <param name="movie" value="js/8wayrun/irc/lightirc.swf" />     <param name="allowfullscreen" value="true" />     <param name="wmode" value="transparent" />     <param name="flashvars" value="host={$server}{$params}{$extras}{$styles}" /> </object>

when click button, activates jquery scripting...

$('#chat_shell').animate({ height: $('#chat_shell').height() + slideheight }, slidespeed);

but instead, when click button, following error:

uncaught typeerror: cannot read property '0' of undefined

why happening , how fix it? know possible solution wrap object/embed div, set height 100% , edit height of div; inelegant solution , has compatibility problems height should never set 100%.

have tried checking $('#chat_shell').height() works on it's own?

i tried out code on flash element on site , worked fine, lead me believe issue arising elsewhere.

have checked event handler button fires properly? have checked jquery initializing properly? have tried other browsers?


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