function coding_map( root_path )
 { 
  

  document.write(' <table border="0" align="center" cellspacing="0" cellpadding="0" vspace="0"> ');
  document.write('   <tr> ');
  document.write('     <td> ');
  document.write('       <div align="center"> <font size="2">  ');
  document.write('       ( <a href="' + root_path + 'coding_index.html"                  >main - coding</a>        ) ');
  document.write('       [     awk     ] ');
  document.write('       [ <a href="' + root_path + 'cpp/cpp_index.html"                 >C++</a>                 ] ');
  document.write('       [     lex     ] ');
  document.write('       [     yacc     ] ');
  document.write('       [ <a href="' + root_path + 'teory/loop.html"                    >theory::loop/cycle</a>    ] ');
  document.write('      </font> </div> ');
  document.write('     </td> ');
  document.write('   </tr> ');
  document.write(' </table> ');
 }