function changeOpac(opacity, id) {
    var object = document.getElementById(id).style;
    object.opacity = (opacity / 100);
    object.MozOpacity = (opacity / 100);
    object.KhtmlOpacity = (opacity / 100);
    object.filter = "alpha(opacity=" + opacity + ")";
}
function leftArrowOff() {
    changeOpac(30,'submenuArrowLeft');
}
function rightArrowOff() {
    changeOpac(30,'submenuArrowRight');
}

function highlightMenu(idx,doHighlight,menuItemName,isActiveCat) {
    var titleDiv = document.getElementById("menu"+idx);
    var menuItemDiv = document.getElementById(menuItemName);
    var className = doHighlight?('menuItemAct'+idx):"menuItem";
    if (!isActiveCat) {
        titleDiv.className=className;
    }
    menuItemDiv.className=className;
}

function highlightHeader(menuItemName,doHighlight) {
    var itemDiv = document.getElementById(menuItemName);
    if (doHighlight) {
        itemDiv.className="active";
    } else {
        itemDiv.className=null;
    }
}