var portal_rules = {
    '.hastooltip' : function (el) {
	el.onmouseover = function(event) {
	    this.title = "";
	    domTT_activate (this, event,
//			    'caption', this.title,
			    'content', document.getElementById (this.id + "tt"), 
			    'type', 'clickable');
	};
    }
};

Behaviour.register(portal_rules);