var cando = false;
var browserName = navigator.appName;
var browserVer = parseInt(navigator.appVersion);
if (browserName == "Netscape" && browserVer >= 3) cando = true;
else if( browserVer >=4 ) cando=true;
if( cando ) {
        imag = new Array();
        imag[0] = "/img/big/b1-off.gif";
        imag[1] = "/img/big/b1-on.gif";
        imag[2] = "/img/big/b2-off.gif";
        imag[3] = "/img/big/b2-on.gif";
        imag[4] = "/img/big/b3-off.gif";
        imag[5] = "/img/big/b3-on.gif";
        imag[6] = "/img/big/b4-off.gif";
        imag[7] = "/img/big/b4-on.gif";
        imag[8] = "/img/big/b5-off.gif";
        imag[9] = "/img/big/b5-on.gif";
        imag[10] = "/img/big/b6-off.gif";
        imag[11] = "/img/big/b6-on.gif";
        imag[12] = "/img/big/b7-off.gif";
        imag[13] = "/img/big/b7-on.gif";
        imag[14] = "/img/big/b8-off.gif";
        imag[15] = "/img/big/b8-on.gif";

        im = new Array()
        for (var i = 0; i < imag.length; i++){
                if( imag[i] != "" ) {
                        im[i] = new Image();
                        im[i].src = imag[i];
                }
        }
}

function swtch(num,imgname){
        if( cando )
        eval("document.getElementById('"+imgname+"').src = im[num].src;");
}