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function fetchWeatherData (callback, zip)
{
var url="http://weather.yahooapis.com/forecastrss?u=f&p=";
var xml_request = new XMLHttpRequest();
xml_request.onload = function(e) {xml_loaded(e, xml_request, callback);}
xml_request.overrideMimeType("text/xml");
xml_request.open("GET", url+zip);
xml_request.setRequestHeader("Cache-Control", "no-cache");
xml_request.send(null);
}