Etiquettes of the Musjid

Q: What is the ruling of the ulema regarding bringing children to the musjid?

Q: Can an ustaaz teaching with a salary teach in the musjid so that he may sit for the sunnat I'tikaaf in Ramadhaanul Mubarak? If not, could he continue with his teaching in the masjid and proportionately give back his salary?

Q: As we starting with collections for a land for a masjid. Some brothers during the mashwerah want to know if there will be salami allowed in our masjid that we want to build? Please explain in detail.

Q: Is it permissable to pass wind in the musjid if one is sleeping in the musjid e.g. in jamaat or i'tikaaf?

Q: Is it permissible to eat and sleep in the masjid?

Q: Is it permissible to deliver a lecture in the masjid whilst sitting on a chair?

Q: If a musalli, seated in the masjid, left to perform wudhu and intends returning. Can he reserve that place until the time he returns by placing a tasbeeh, shawl etc.?

Q: Is it permissible for one to enter the musjid without wudhu?

Q: Is it permissible for one to comb his hair in the masjid?

Q: What should a person do if he had a wet dream in the masjid?