mahr-e-mithal

Q: What is the Shar'ee haq-e-mehr on marriage?

Q: A boy is getting married. Although he is not wealthy, he pays zakaat. Does he pay mahr-e-faatimi or the minimum mahr?

Q: Who asks for the dowry, the bride or the parents? If dowry is the right of the bride, can the parents disagree with her if she accepts less mahr?