function hideAll() {
    document.itemDetailsBlock = document.getElementById("preview");
    document.itemDetails = document.itemDetailsBlock.getElementsByTagName("div");
    for (var ti=0;ti<document.itemDetails.length;ti++) {
        var itemDetail = document.itemDetails[ti];
        itemDetail.style.display="none";
    }
}

function showID(ID) {
    hideAll();
    document.getElementById(ID).style.display="block";
}