function f_read(str, tr)
{
   var pre="http://bombina.msk.ru/";
   if(tr==1)
   {
      //--------open the book in a new window-------------
      var win=window.open(top.document.location);
      d=win.document;
   }
   else d=top.document;
   d.writeln('<frameset rows="*,0%" border="0" framespacing="0">');
   d.writeln('<frame src="'+pre+'books/display_book_frame.html" name="book" scrolling="No">');
   d.writeln('<frame src="'+pre+'books/'+str+'" name="book_text" scrolling="No">');
   d.writeln('</frameset>');
}