// tabs function
var cur_lyr;
function swapLayers(id) {
    if (!cur_lyr) hideLayer('reviews');
    else if (cur_lyr) hideLayer(cur_lyr);
    showLayer(id);
    cur_lyr = id;
}
function showLayer(id) {
    var lyr = getElemRefs(id);
    if (lyr && lyr.css) lyr.css.display = "block";
    var litab = getElemRefs("tab" + id);
    if (litab && litab.className) litab.className = "selected";
}


function hideLayer(id) {
    var lyr = getElemRefs(id);
    if (lyr && lyr.css) lyr.css.display = "none";

    var litab = getElemRefs("tab" + id);
    if (litab && litab.className) litab.className = "normal";
}
function getElemRefs(id) {
    var el = (document.getElementById) ? document.getElementById(id) : (document.all) ? document.all[id] : (document.layers) ? document.layers[id] : null;
    if (el) el.css = (el.style) ? el.style : el;
    return el;
}