function getElement( e ){
    if ( typeof(e) == "string" )
        return document.getElementById( e );
    return e;
};

function showElement( e ){
    e = getElement( e );
    e.style.display = "block";
}

function hideElement( e ){
    e = getElement( e );
    e.style.display = "none";
}

function setClass( e , c){
    e = getElement( e );
    if ( e ){
        e.className = c;
    }
}