masqita

// prototype
new Ajax.Request("/your/mom", onSuccess: function(response) { $("lightbox_content").innerHTML = response.responseJSON.contents })

// jquery
$.getJSON("/your/mom", function(json) { $("#lightbox_content").html(json.contents) })

// prototype sprinkled with a bit of love (last command out of my head)

// Helpers to make JSON requests a bit cleaner.
Ajax.Json = {