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pathArray = document.referrer.split( '/' );
protocol = pathArray[0];
host = pathArray[2];

url_anterior = protocol + '//' + host;

url_actual = window.location.protocol + "//" + window.location.host;


function goBackOrGoHome(){
  if ( url_anterior == url_actual) {
    window.history.back();    
  }else{
    window.location = home_url;
  };
}