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[1] = "/_img/m1_t1.gif"; 
imgsrc[2] = "/_img/m1a_t1.gif"; 
imgsrc[3] = "/_img/m2_t1.gif"; 
imgsrc[4] = "/_img/m2a_t1.gif";
imgsrc[5] = "/_img/m3_t1.gif"; 
imgsrc[6] = "/_img/m3a_t1.gif"; 
imgsrc[7] = "/_img/m4_t1.gif"; 
imgsrc[8] = "/_img/m4a_t1.gif";
imgsrc[9] = "/_img/m5_t1.gif"; 
imgsrc[10] = "/_img/m5a_t1.gif"; 
imgsrc[11] = "/_img/m6_t1.gif"; 
imgsrc[12] = "/_img/m6a_t1.gif"; 
imgsrc[13] = "/_img/m7_t1.gif"; 
imgsrc[14] = "/_img/m7a_t1.gif"; 
imgsrc[15] = "/_img/m9_t1.gif"; 
imgsrc[16] = "/_img/m9a_t1.gif"; 


if (getAppVersion()) {
 img = new Array();
 for (i=1; i < imgsrc.length; i++) {
  img[i] = new Image();
  img[i].src = imgsrc[i];
 }
}