var isNav, isIE;

if (parseInt(navigator.appVersion) >= 4) {

   if (navigator.appName == 'Netscape') { isNav = true; }
   else { isIE = true; }
 }
 else {
   alert("4.0");
 }


if (document.images)
{       b1on = new Image();   b1on.src = "/but/menu11.jpg";
        b1off = new Image();   b1off.src = "/but/menu1.jpg";
        b2on = new Image();   b2on.src = "/but/menu22.jpg";
        b2off = new Image();   b2off.src = "/but/menu2.jpg";
        b3on = new Image();   b3on.src = "/but/menu33.jpg";
        b3off = new Image();   b3off.src = "/but/menu3.jpg";
        b4on = new Image();   b4on.src = "/but/menu44.jpg";
        b4off = new Image();   b4off.src = "/but/menu4.jpg";
        b5on = new Image();   b5on.src = "/but/menu55.jpg";
        b5off = new Image();   b5off.src = "/but/menu5.jpg";
}

function rollOver(img,state)
{       if (document.images)

        if (state=="on") {
        document.images[img].src = eval(img + "on.src");
                }
            else {
        document.images[img].src = eval(img + "off.src");
               }
}