Javascript HTTP response

I've been using this along with prototype to make simple ajax calls. In essence you make the calls from the client with...

new Ajax.Request('url',{parameters:{'someparam':$('someparam').value}}); return false;

On the onsubmit event of a form, onclick or whatever. Note that the return false is important to prevent the page from reloading. Sending some javascript to be executed back to the client is then as simple as setting up your view to return:

return HttpJavascriptResponse('alert("boing");')

So, yeah, prototype does the real work and this class does little other than make it clear what our intentions are and reduce the opportunities for typos. But it works for me.