Headscarves

So what's the deal?

Why are the ladies at King's wearing headscarves when they are prophesying (don't you just get so confused on how you're supposed to spell that?!!)? Is it Biblical and ought we all be doing it?

The discussion on the forum hasn't helped much yet http://www.norwichyfc.co.uk/YaBBSE/index.php?topic=7607.0

But a couple of verses have been mentioned:
1 Corinthians 11:11-16
In the Lord, however, woman is not independent of man, nor is man independent of women. For as woman came from man, so also is man born of woman. But everything comes from God. Judge for yourselves: Is it proper for a woman to pray to God with her head uncovered? Does not the very nature of things teach you that if a man has long hair, it is a disgrace to him, but if a woman has long hair, it is her glory? For long hair is given to her as a covering If anyone wants to be contentious about this, we have no other practise - nor do the churches of God.

Help please?