So add it after you flatten it. Something like:
HTML Code:
<style type="text/css">
.top {width: 100% !important;}
.bottom {clear: both; width: 100% !important;}
</style>
<div id="doc3">
<div id="bd">
<div class="yui-g">
<div class="yui-tvb-l25 first yui-panel">
<ul class="list_no_decoration widget_list" id="widgetlist_column1">$column[1]</ul>
</div>
<div class="yui-tvb-l50 first yui-panel">
<div class="yui-g top">
<ul class="list_no_decoration widget_list" id="widgetlist_column2">$column[2]</ul>
</div>
<div class="yui-g bottom">
<div class="yui-u first">
<ul class="list_no_decoration widget_list" id="widgetlist_column5">$column[5]</ul>
</div>
<div class="yui-u">
<ul class="list_no_decoration widget_list" id="widgetlist_column4">$column[4]</ul>
</div>
</div>
</div>
<div class="yui-tvb-l25 first yui-panel">
<ul class="list_no_decoration widget_list" id="widgetlist_column3">$column[3]</ul>
</div>
</div>
</div>
</div>