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flash
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var params:Object
=URLUtil.parseUrlParameters(ExternalInterface.call("window.location.search.substring",
1));
var param1:String=params["p1"];
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public static function parseUrlParameters(query:String):Object{
     var params:Object = {};
     if(query) {
                var pairs:Array
=
query.split("&");
                for(var i:uint=0; i < pairs.length; i++) {
                    var pos:int = pairs.indexOf("=");
                    //Alert.show(String(pos));
                    if(pos != -1) {
                        var argname:String = pairs.substring(0, pos);
                        var value:String = pairs.substring(pos+1);
                        params[argname] = value;
                    }
                }
            }
            return params;
  }
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 <mx:Model id="books">
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