scriptaculous requirements
For some strange reason, a hidden element that will be worked on by scriptaculous must have its display:none style inline, within the element, and not from a css class.
="fb_close" class="fb_close" onclick="new Effect.BlindUp($('flash_box'), {duration:0.25})">
Close This
span>
</div>
<div id="flash_box" class="flash_box" style="display:none;"> <div id="fb_content" class="fb_content"> <%= flash[:warning] %>
The div 'flash_box' only works with scriptaculous when
style="display:none;"
is used _inline_.