var oldShow = "productDescription";
function switchProductInfo(show) {
    if(typeof(oldShow) != "undefined") {
        if(document.getElementById(oldShow)) {
            document.getElementById(oldShow).style.display = "none";
        }
    }
    if(document.getElementById(show)) {
        document.getElementById(show).style.display = "block";
        oldShow = show;
    }

    return true;
}