How to call dymanically an id (span, td, etc) ?

Hi.
I’m french then my problem is not easy to explain (for me).

I’ve a some td in a table that i want to change bgcolor.
then i’ve named my td as :

<td id=”td1″ align…..
<td id=”td2″ align…..
etc

then i can do :
td_1.bgColor=’f0f0f0′;

but for some reason i need to call dynamically the name of the td. i’ve tried this :

my_number = comes from a function will be 1,2, etc;
[“td” + my_number].bgColor=’ffffff’;

and this doesn’t work. i’ve put “document.” before but nothing better.

do you know the correct syntax for this ? thanks

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