[Proto-Scripty] Ajax.Request fails, while vanilla XHR works fine

[Walter Lee Davis]

Same browser (Safari.latest) on the same computer, the Prototype method gives 
me a security failure (Origin [my host] is not allowed by 
Access-Control-Allow-Origin.) while the long-hand XHR (inside a Prototype 
observer) just works without any comment:

Prototype:
  $('zip').observe('change',function(evt){
    var elm = this;
    new Ajax.Request('http://zip.elevenbasetwo.com', {
      method: 'get',
      parameters: {zip: $F(elm)},
      onComplete: function(transport){
        var data = responseText.evalJSON();
        $('city').setValue(data.city);
        $('state').setValue(data.state);
      }
    });
 });

XHR:
  $('zip').observe('change',function(evt){
    var client = new XMLHttpRequest();
    client.open("GET", "http://zip.elevenbasetwo.com?zip="; + $F(this), true);
    client.onreadystatechange = function() {
      if(client.readyState == 4) {
        var data = client.responseText.evalJSON();
        $('city').setValue(data.city);
        $('state').setValue(data.state);
      };
    };
    client.send();
  });

I don't trust this to work in the range of browsers supported by Prototype, 
naturally, so I'd really like to know what I could do to get it to work in 
Prototype.

Thanks,

Walter

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