InitializeMenu = function()
{
  $$('#left_nav li').each( function(el) {
    
    el.setStyle({position: 'relative'});
    
    el.getElementsBySelector('ul').each( function(ul) {

      ul.setStyle({
        position: 'absolute',
        top: '0',
        left: '100%' ,
        width: '200px',
        zIndex: 500
      });
      
    });
    
    
    el.onmouseover = function()
    {
      el.addClassName('over');
      ul = el.down('ul');

      if (ul) ul.setStyle({ display: 'block' });
      
    }
    el.onmouseout =  function()
    {
      el.removeClassName('over');
      ul = el.down('ul');

      if (ul) ul.setStyle({ display: 'none' });
      
    }
      
  });
}

Event.observe(window, 'load', InitializeMenu );