function show( targets )
{
    target_list = targets.split(',');
    for( i = 0 ; i < target_list.length; i++ )
    {
        document.getElementById( target_list[i] ).style.display="block";
    }
}
function hide( targets )
{
    target_list = targets.split(',');
    for( i = 0 ; i < target_list.length; i++ )
    {
		document.getElementById( target_list[i]).style.display="none";
    }
}