function $( id )
{
    if (document.getElementById)
        var returnVar = document.getElementById(id);
    else if (document.all)
        var returnVar = document.all[id];
    else if (document.layers)
        var returnVar = document.layers[id];
    return returnVar;
}

function show( object_id )
{       
    $(object_id).style.display = 'block';
}

function hide( object_id )
{
    $(object_id).style.display='none';
}