// These two are from http://asciicasts.com/episodes/197-nested-model-form-part-2

function remove_fields(link) {
	$(link).previous("input[type=hidden]").value = "1";
	$(link).up(".fields").hide();
}

function add_fields(link, association, content) {
 var new_id = new Date().getTime();
 var regexp = new RegExp("new_" + association, "g");
 $(link).up().insert({
   before: content.replace(regexp, new_id)
 });
}