function sp_select(selected)
{
document.getElementById('sptab_users').src='layout/'+style+'/sp/users_off.png';
document.getElementById('sptab_types').src='layout/'+style+'/sp/types_off.png'; 
document.getElementById('sptab_prices').src='layout/'+style+'/sp/prices_off.png';     
document.getElementById('sptab_'+selected).src='layout/'+style+'/sp/'+selected+'_on.png';
document.getElementById('sp_users').style.display='none';
document.getElementById('sp_types').style.display='none'; 
document.getElementById('sp_prices').style.display='none';     
document.getElementById('sp_'+selected).style.display='block';     
}