jQuery - how can I find the element with a certain id?

Question

I have a table and each of its td has a unique id that corresponds to some time intervals (0800 til 0830... 083

Answer 1

This

var verificaHorario = $("#tbIntervalos").find("#" + horaInicial);

will find you the td that needs to be blocked.

Actually this will also do:

var verificaHorario = $("#" + horaInicial);

Testing for the size() of the wrapped set will answer your question regarding the existence of the id.