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" )
{
    kur_on      = new Image ( );
    kur_on.src  = "images/firmalar/tamer2.png";
    med_on      = new Image ( );
    med_on.src  = "images/firmalar/metals2.gif";
    lin_on      = new Image ( );
    lin_on.src  = "images/firmalar/tamerr2.gif";
    ist_on      = new Image ( );
    ist_on.src  = "images/firmalar/sim2.gif";
    res_on      = new Image ( );
    res_on.src  = "images/firmalar/logo2.png";

    
    kur_off     = new Image ( );
    kur_off.src = "images/firmalar/tamer1.png";
    med_off     = new Image ( );
    med_off.src = "images/firmalar/metals1.gif";
    lin_off     = new Image ( );
    lin_off.src = "images/firmalar/tamerr1.gif";
    ist_off     = new Image ( );
    ist_off.src = "images/firmalar/sim1.gif";
    res_off     = new Image ( );
    res_off.src = "images/firmalar/logo1.png";


}

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

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