Hi,
this is the problem:
I  created a Map of number; every key is equal to value.
Using this map inside the <input:select> tag I saw that no values are created.
Looking at the tablib source code I have noticed that there is an explicit line 
of code (approx line 222 of org.apache.taglibs.input.java) where test if key 
equals value, in this cause value is not written.
This, in my opinion, could generate problem if there is, in jsp page, a 
javascript validation funciont related to select box. 
No problem, instead, if I submit the form without validation.

This is a piece of my code:

Map m = new Hashtable();
m.put("1","1");
m.put("2","2");
m.put("3","3");

<input:select name="choice" options="<%= m %>"/>

Thanks in advance for suggestion to solve this problem.
Massimo