function changeTab(activeTab)
{
    //Attivo il tab selezionato
    document.getElementById('contentFilterAeroporto').style.display='none';
    document.getElementById('contentFilterTrattam').style.display='none';
    document.getElementById('contentFilterLoc').style.display='none';
    document.getElementById('contentFilterData').style.display='none';
    document.getElementById('contentFilterDurata').style.display='none';
    document.getElementById(activeTab).style.display='block';

	document.getElementById('Aeroporto').className ="";
    document.getElementById('Trattam').className ="";
    document.getElementById('Loc').className ="";
    document.getElementById('Data').className ="";
    document.getElementById('Durata').className ="";
    
    
    if (activeTab=='contentFilterAeroporto'){
      document.getElementById('Aeroporto').className ='selected';
    }
        if (activeTab=='contentFilterTrattam')
        {
        document.getElementById('Trattam').className ='selected';
    }
        if (activeTab=='contentFilterLoc'){
   document.getElementById('Loc').className ='selected';
    }
        if (activeTab=='contentFilterData'){
       document.getElementById('Data').className ='selected';
    }
        if (activeTab=='contentFilterDurata'){
      document.getElementById('Durata').className ='selected';
    }
    
}