How to focus in Salah?

In accordance with a verse of the Holy Qur'an, a character of Mo'menin (believers) is Khoshu'(humility) in Salah. Surah al-Mo'menoon, the first and second verses: > قَدْ أَفْلَحَ الْمُؤْمِنُونَ > > . الَّذِينَ هُمْ فىِ صَلَاتهِمْ خَاشِعُونَ > > > > Certainly will the believers have succeeded: (1) > > They who are during their prayer humbly submissive (2) Seemingly, concentration in Salah is considered as an aspect of Khoshoo'. Actually paying attention in Salah (concentration) could increase its acceptability for Allah. But unfortunately, it is hard to concentrate during Salah (for many people among me) and in fact our attentions go to different places and matters. Note: **I'm looking for some ways which could help us concentrate during our prayers. Is there any tradition regarding it?** (I mean any tradition about "How to focus in Salah")