You're lucky I'm still on line <s>. Don't start "conversations" with me here and expect replies, Fabio, because I will probably not get here again for months <s>.

I don't understand from your question what exactly you don't understand <s>. There is nothing especially outré about the condition/requirement you propose (except of course the use of my name in the condition <g>). It should be do-able.

Please give it a good try on your own. If after some work you can't figure it out, and if you can e-mail me what you have done in a simple example, I'll try to help. Please *don't* reply here and expect me to see the message.

>L<