var js_friendly = 0;
var loaded = 0;
function jsCheck(){
       if((navigator.appName == "Netscape" && parseInt(navigator.appVersion) >=3) ||
          (navigator.appName == "Microsoft Internet Explorer" && parseInt(navigator.appVersion) >=4))
               js_friendly = 1;
       else
               js_friendly = 0;
}
jsCheck();
function cache_images()
{path = "";
        if(js_friendly == 1)
        {
                M1_on = new Image();
                M1_on.src = path + "linkyldteave2.jpg";
                M1_off = new Image();
                M1_off.src = path + "linkyldteave.jpg";
                M1_screen = new Image();
                M1_screen.src = path + "kullyldteave.jpg";

                M2_on = new Image();
                M2_on.src = path + "linkmuusika2.jpg";
                M2_off = new Image();
                M2_off.src = path + "linkmuusika.jpg";
                M2_screen = new Image();
                M2_screen.src = path + "kullmuusika.jpg";

                M3_on = new Image();
                M3_on.src = path + "linkkunst2.jpg";
                M3_off = new Image();
                M3_off.src = path + "linkkunst.jpg";
                M3_screen = new Image();
                M3_screen.src = path + "kullkunst.jpg";

                screen_off = new Image();
                screen_off.src = path + "kullesileht1.jpg";
                loaded = 1;   
        }}
function t_b(imagename)
{if(loaded)
                if(js_friendly)
                {document.images[imagename].src = eval(imagename + '_on.src');
                 document.images['screen'].src = eval(imagename + '_screen.src');
                }}
function t_d(imagename)
{if(loaded)
                if(js_friendly)
                {document.images[imagename].src = eval(imagename + '_off.src');
                 document.images['screen'].src = eval('screen_off.src');
}}