ok... cambia el menu_izda a:
<div id="menu_izda">
Left Col<br>
This is content of the LEFT column. It can be short, longer or very long. This is content of the LEFT column. It can be short, longer or very long. This is content of the LEFT column. It can be short, longer or very long.
<div style="clear:both; height: 1px; width: 100%;"></div>
</div>
Chécalo así...