function OpenMenu(id){
    if (document.getElementById(id).style.display=="none") {
        document.getElementById(id).style.display="block";
    }
    else {
        document.getElementById(id).style.display="none";
    }
}

function showArrow(img_name){
 document.getElementById(img_name).src = '/imgs/triangle.gif';
}
function hideArrow(img_name){
 document.getElementById(img_name).src = '/imgs/spacer.gif';
}