var tour=null;
function open3D(path){
  nname=navigator.appName;
  if(tour){
    if((nname.indexOf('Netscape')>=0 && document.hiddenform.closed.value==0) || (nname.indexOf('Netscape')<0) ){
      tour.close();
    }
  }
  tour=window.open(path,'3DView','toolbar=no,location=no,scrollbars=no,resizeable=no,menubar=no,status=no,top=30,left=30,width=500,height=600');
}