var active_submenu = "";

function hideElement(elementId) {
    if(!document.getElementById(elementId).className.match(/HideElement/)) {
      document.getElementById(elementId).className=document.getElementById(elementId).className.replace(/ShowElement/,"");
      document.getElementById(elementId).className += ' HideElement';
    }
}

function showElement(elementId) {
    if (active_submenu != "") {hideElement(active_submenu);}
    document.getElementById(elementId).className=document.getElementById(elementId).className.replace(/HideElement/,"");
    document.getElementById(elementId).className += ' ShowElement';
    active_submenu = elementId;
}

function keepElement(elementId) {
    document.getElementById(elementId).className=document.getElementById(elementId).className.replace(/HideElement/,"");
}

function startHideTimeout() {
    hideOnNoUse = window.setTimeout("hideElement('"+active_submenu+"')", 500);
}

function openSlideShowPopUp(popUpTitle, eventID, picIdx, lastPicIdx) {
    popUpUrl =  "./slideshow.php" +
                "?EventID=" + eventID +
                "&PicIdx=" + picIdx +
                "&LastPicIdx=" + lastPicIdx +
                "&SlideShow=0" +
                "&Title=" + popUpTitle;

    popup = window.open(popUpUrl, "SlideShow",
                        "width=820,height=800,menubar=no,toolbar=no,scrollbars=no,status=no,resizable=no,location=no,hotkeys=no");
}