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funcion add(x,y)
{
document.write(' <a name=a' + (x + 1) + ' href="#' + (x != 0 ? 'a' + y + ' ' : ('a' + x + ' ')) + '"> < <上一个 </a>');
document.write(' <a href="#' + ( x != y ? 'a' + y + 2 +' ' : 'a1 ' ) + '">下一个>>d </a>');
}