addEventListener('hashchange', (event) => { 
    setPage();
});
function setPage(){
    document.querySelectorAll('.spapage').forEach(e=>{
        e.hidden=true;
    });
    var hash=window.location.hash.replace('#','');
    if(hash.length === 0)
    {
        hash="index";
    }
    
    document.getElementById(hash).hidden=false;
}
setPage();