function cambio(val){
opzioni = document.getElementById('modello').length;
for(i=0;i<=opzioni;i++){document.getElementById('modello').options[opzioni-i]=null;}
Ties= new Array()
Ties[0]=new Option('Select','');
Ties[1]=new Option('Saddle Stitched','8');
Ties[2]=new Option('Cerimony','12');
if(val=='4'){array_rif=Ties;}
Shirts= new Array()
Shirts[0]=new Option('Select','');
if(val=='9'){array_rif=Shirts;}
for(i=0;i<array_rif.length;i++){
document.getElementById('modello').options[i]=array_rif[i]
}
}