function displayActive(item){
    item.className += "hover";
}
function hideActive(item){
    item.className = item.className = "";
}

var popupwin;
function openpopup(url,w,h) {
    var popupwinW = w;
    var popupwinH = h;
    var popupwinPosL = (screen.availWidth - popupwinW) / 2;
    var popupwinPosT = (screen.availHeight - popupwinH) / 2;
    var nwparam = "width=";
    nwparam += parseFloat(popupwinW) + ", height=";
    nwparam += parseFloat(popupwinH) + ", left=";
    nwparam += parseFloat(popupwinPosL) + ", top=";
    nwparam += parseFloat(popupwinPosT) + ",scrollbars=yes";
    popupwin = window.open(url,"popopWin", nwparam);
    popupwin.focus();

}