var myrules = 
{
    'body div.mapContainer li a' : function(element)
    {
        element.onmouseover = function() { window.status = "see what's on in " + this.parentNode.id; return true; }
        element.onmouseout  = function() { window.status = ''; return true; }
    }
}; 

Behaviour.register(myrules);