function NavShow( elementIdName ) {    
    document.getElementById( elementIdName ).style.display = "block";
    document.getElementById( "nwC" ).className = "drop_on dd";
}

function NavHide( elementIdName ) {
    document.getElementById( elementIdName ).style.display = "none";
    document.getElementById( "nwC" ).className = "drop dd";
}

function initNWL() {
    document.getElementById( "nwC" ).onmouseover = nwMouseOver;
    document.getElementById( "nwC" ).onmouseout = nwMouseOut;
    document.getElementById( "nwBox" ).onmouseover = nwMouseOver;
    document.getElementById( "nwBox" ).onmouseout = nwMouseOut;
}

function nwMouseOver() { NavShow( "nwBox" ); }
function nwMouseOut()  { NavHide( "nwBox" ); }