function showSubMenu(id,marginLeft,width){
    document.getElementById(id+"SubMenu").style.display="block";
    document.getElementById(id+"SubMenu").style.width = width + "px";
    if (navigator.appName=='Microsoft Internet Explorer'){
        document.getElementById(id+"SubMenu").style.marginLeft = "-" + marginLeft + "px";
    }
}

function hideSubMenu(id){
    document.getElementById(id+"SubMenu").style.display="none";
}

function showHoverEffect(id){
    document.getElementById(id+"MenuImg").src = "images/" + id + "_on.gif";
}

function hideHoverEffect(id){
    document.getElementById(id+"MenuImg").src = "images/" + id + "_off.gif";
}