function show(name) {
     obj = document.getElementById(name); obj.style.display = "block";
}

function hide(name) {
     obj = document.getElementById(name); obj.style.display = "none";
}

function toogle(name) {
    if (isHidden(name)) show(name);
    else hide(name);
} 

function isHidden(name) {
    obj = document.getElementById(name); return (obj.style.display == "none");
}

function isShown(name) {
    obj = document.getElementById(name); return (obj.style.display == "block");
}

function showAlert( value ) {
    alert( value );
}