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;
     document[imgname].src=img[num].src;
  }
}

imgsrc=new Array();

imgsrc[0] = "/images/home_blue.gif";
imgsrc[1] = "/images/home.gif";
imgsrc[2] = "/images/home_blue.gif";
imgsrc[3] = "/images/home.gif";

if( getAppVersion() ) {
   img=new Array();

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