if (navigator.appName == "Netscape" && parseInt(navigator.appVersion) >= 3) version = 2; 
if (navigator.appName == "Microsoft Internet Explorer" && parseInt(navigator.appVersion.substring(0,1)) > 3) version = 3;

function But(MouseOverImage,MouseOutImage,MouseDownImage) {
   this.ImageOver = new Image();
   this.ImageOver.src = MouseOverImage;
   this.ImageOut  = new Image();
   this.ImageOut.src  = MouseOutImage;
   this.ImagePressed = new Image();
   this.ImagePressed.src = MouseDownImage;
}

function flip_pix(linkname,mode,pos){
   if (version > 1){
      if (mode == 1 && marker != pos) this.document[linkname].src = Button[pos].ImageOver.src;
	  else  if (marker != pos) {
                   this.document[linkname].src = Button[pos].ImageOut.src;
                   }
   }
}

function Set(linkname,pos){
   if (version > 1){
      if (marker != 0 && marker != pos) this.document[markerlink].src = Button[marker].ImageOut.src;
      markerlink = linkname;
      marker=pos;
      this.document[markerlink].src = Button[marker].ImagePressed.src;
      }
}