File load from server javascript cakephp2

I have a aplication in cakephp2. In home.ctp I wan't to use a javascript function to load a file from filesystem and create a track in a map, but I donn´t know how to locate it. In the javascript function I declare a var with the name of the file and then I check if the file exists, and always return false. var gpxfile='WWW_ROOT.files.DS.hoyo.gpx'; if(file_exists(gpxfile)){ alert('Si existe'); } else { alert('No existe'); } I tried with the names: var gpxfile='WWW_ROOT.files.DS.hoyo.gpx'; var gpxfile='/app/files/hoyo.gpx'; var gpxfile='/files/hoyo.gpx'; var gpxfile='/webroot/files/hoyo.gpx'; But nothing. How can I locate it? It is necesary to configure the core.php? Thanks

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