browser_name = navigator.appName;
browser_version = parseFloat(navigator.appVersion); 

if (browser_name == "Netscape" && browser_version < 2.0)
        {
        browserOk = 'false';
        }
else if (browser_name == "Netscape" && browser_version == 2.0)
        {
        browserOk = 'false';
        }
else if (browser_name == "Netscape" && browser_version >= 3.0)
        {
        browserOk = 'true';
        }
else if (browser_name == "Microsoft Internet Explorer" && browser_version <= 2.0)
        {
        browserOk = 'false';
        }
else if (browser_name == "Microsoft Internet Explorer" && browser_version >= 3.0)
        {
        browserOk = 'true';
        }
else
        {
        browserOk = 'false';
        }

function button01on()    {if (browserOk == 'true')document.button01.src = bton01.src;}   
function button01off()   {if (browserOk == 'true')document.button01.src = btoff01.src;}
function button02on()    {if (browserOk == 'true')document.button02.src = bton02.src;}   
function button02off()   {if (browserOk == 'true')document.button02.src = btoff02.src;}
function button03on()    {if (browserOk == 'true')document.button03.src = bton03.src;}   
function button03off()   {if (browserOk == 'true')document.button03.src = btoff03.src;}
function button04on()    {if (browserOk == 'true')document.button04.src = bton04.src;}   
function button04off()   {if (browserOk == 'true')document.button04.src = btoff04.src;}
function button05on()    {if (browserOk == 'true')document.button05.src = bton05.src;}   
function button05off()   {if (browserOk == 'true')document.button05.src = btoff05.src;}
function button06on()    {if (browserOk == 'true')document.button06.src = bton06.src;}   
function button06off()   {if (browserOk == 'true')document.button06.src = btoff06.src;}
function button07on()    {if (browserOk == 'true')document.button07.src = bton07.src;}   
function button07off()   {if (browserOk == 'true')document.button07.src = btoff07.src;}
function button08on()    {if (browserOk == 'true')document.button08.src = bton08.src;}   
function button08off()   {if (browserOk == 'true')document.button08.src = btoff08.src;}


if (browserOk == 'true')
        {
               

                var bton01=new Image();
                var btoff01=new Image();
                var bton02=new Image();
                var btoff02=new Image();
                var bton03=new Image();
                var btoff03=new Image();
                var bton04=new Image();
                var btoff04=new Image();
                var bton05=new Image();
                var btoff05=new Image();
                var bton06=new Image();
                var btoff06=new Image();
                var bton07=new Image();
                var btoff07=new Image();
                var bton08=new Image();
                var btoff08=new Image();
               

                bton01.src="img/porton.jpg";
                btoff01.src="img/portoff.jpg";
                bton02.src="img/konon.jpg";
                btoff02.src="img/konoff.jpg";
                bton03.src="img/galon.jpg";
                btoff03.src="img/galoff.jpg";
                bton04.src="img/akton.jpg";
                btoff04.src="img/aktoff.jpg";
                bton05.src="img/porton2.jpg";
                btoff05.src="img/portoff2.jpg";
                bton06.src="img/konon2.jpg";
                btoff06.src="img/konoff2.jpg";
                bton07.src="img/galon2.jpg";
                btoff07.src="img/galoff2.jpg";
                bton08.src="img/akton2.jpg";
                btoff08.src="img/aktoff2.jpg";
        }