browserName = navigator.appName;

browserVer = parseInt ( navigator.appVersion );

version = "n2";

if ( browserName == "Netscape" && browserVer >= 3 ) version = "n3";

if ( browserName == "Microsoft Internet Explorer" && browserVer >=4 ) version = "e4";

if (version == "n3" || version == "e4" ) {
    home_on = new Image ( 140, 26 );
    home_on.src = "images/home_on.gif";
    lunch_on = new Image ( 140, 26 );
    lunch_on.src = "images/lunch_on.gif";
    dinner_on = new Image ( 140, 26 );
    dinner_on.src = "images/dinner_on.gif";
    drink_on = new Image ( 140, 26 );
    drink_on.src = "images/drink_on.gif";
    dessert_on = new Image ( 140, 26 );
    dessert_on.src = "images/dessert_on.gif";
    oil_on = new Image ( 140, 26 );
    oil_on.src = "images/oil_on.gif";
    contact_on = new Image ( 140, 26 );
    contact_on.src = "images/contact_on.gif";
    home_off = new Image ( 140, 26 );
    home_off.src = "images/home_off.gif";
    lunch_off = new Image ( 140, 26 );
    lunch_off.src = "images/lunch_off.gif";
    dinner_off = new Image ( 140, 26 );
    dinner_off.src = "images/dinner_off.gif";
    drink_off = new Image ( 140, 26 );
    drink_off.src = "images/drink_off.gif";
    dessert_off = new Image ( 140, 26 );
    dessert_off.src = "images/dessert_off.gif";
    oil_off = new Image ( 140, 26 );
    oil_off.src = "images/oil_off.gif";
    contact_off = new Image ( 140, 26 );
    contact_off.src = "images/contact_off.gif";
}

function button_on ( imgName ) {
    if ( version == "n3" || version == "e4" ) {
        butOn = eval ( imgName + "_on.src" );
        document [imgName].src = butOn;
    }
}

function button_off ( imgName ) {
    if ( version == "n3" || version == "e4" ) {
        butOff = eval ( imgName + "_off.src" );
        document [imgName].src = butOff;
    }
}