function hide_preview(id) {
    preview = document.getElementById(id);
    preview.style.visibility = 'hidden';
    preview.style.position   = 'absolute';
}

function show_preview(id) {
    preview = document.getElementById(id);
    preview.style.visibility = 'visible';
    preview.style.position   = 'static';
}

// right now, this only works for the holiday e-cards
function select_card(index, total, id) {
    document.getElementById("card_id").value = id;
    
    for (i = 1; i <= total; i++ ) {
        if (id == i) {
            document.getElementById("thumb_" + i).className = 'selected';
            show_preview('preview_' + i);
        } else {
            document.getElementById("thumb_" + i).className = '';
            hide_preview('preview_' + i);
        }
    }
    return false;
}

// used to clear the first/last name default values
function clear_default(id, str) {
    obj = document.getElementById(id);
    if (obj.value == str) {
        obj.value = "";
    }
}