function getAppVersion() {
        appname= navigator.appName;
        appversion = navigator.appVersion;
        majorver = appversion.substring(0, 1);
        if ((appname == "Netscape") && ( majorver >= 3 )) return 1;
        if ((appname == "Microsoft Internet Explorer") && (majorver >= 4)) return 1;
        return 0;
}

function swtch(num, imgname) {
        if (getAppVersion()) {
        document[imgname].src = img[num].src;
        }
 }

imgsrc = new Array();
imgsrc[0]  = "smppi/buttons_sub0.gif";
imgsrc[1]  = "smppi/buttons_sub1.gif";
imgsrc[2]  = "smppi/buttons_sub2.gif";
imgsrc[3]  = "smppi/buttons_sub3.gif";
imgsrc[4]  = "smppi/buttons_sub4.gif";
imgsrc[5]  = "smppi/buttons_sub5.gif";
imgsrc[6]  = "smppi/buttons_sub6.gif";
imgsrc[7]  = "smppi/buttons_sub7.gif";
imgsrc[8]  = "smppi/buttons_sub8.gif";
imgsrc[9]  = "buttons_data0.gif";
imgsrc[10] = "buttons_data1.gif";
imgsrc[11] = "buttons_data2.gif";
imgsrc[12] = "buttons_data3.gif";
imgsrc[13] = "buttons_data4.gif";
imgsrc[14] = "buttons_data5.gif";
imgsrc[15] = "buttons_data6.gif";
imgsrc[16] = "buttons_data7.gif";
imgsrc[17] = "buttons_data8.gif";

if (getAppVersion()) {
        img = new Array();
        for (i = 0; i < imgsrc.length; i++) {
                img[i] = new Image();
                img[i].src = imgsrc[i];
        }
}