You could implement your own `replaces` function within Elements. http://jsfiddle.net/subhaze/AfeBV/
Elements.implement('replaces', function(old, where){
if(!old) return;
var _where = where || 'after',
_old = document.id(old);
this.inject(_old, _where);
_old.destroy();
});
$$(elements).replaces(element);
