var tracer = {
	clicked: function(el, ev) {
		core.stopevent(ev);
		this.show_block(el);
	}, 
	show_block: function(el, flag, skiplink) {
		if (!el || !(padder = core.getchild(el, 1)) || !(block = core.getchild(el, 2))) return
		padder.style.display = block.style.display = (flag == undefined ? (block.style.display == 'none' || !block.style.display ? 'block' : 'none') : (flag ? 'block' : 'none'))
	}
}