Moment of Silence is Unconstitutional?

“A Texas family is suing Gov. Rick Perry and a school district over a state-mandated moment of silence in schools, according to The Dallas Morning News. David Wallace Croft and his wife, Shannon, of Carrollton, Texas, have three children at Rosemeade Elementary and argue that the moment of silence is unconstitutional and amounts to state-sanctioned school prayer.

The couple has a history of complaints against religious-affiliated words and images in schools, having previously complained about Boy Scout rallies held during school, fliers sent home about Good News Bible Club meetings and the inclusion of “Silent Night” and a Hanukkah song in holiday concerts, according to report.

Krista Moody, a spokeswoman for Perry, said the moment of silence law that the Crofts filed a suit against on March 1, 2006, was passed in 2003 and calls for students to observe a moment of silence after reciting pledges to the U.S. and Texas flags each day… Moody said the beauty behind the freedom of the law is children get to do with the moment what they wish. There are no guidelines behind the silence.
Source

How the hell is a moment of silence unconstitutional? They are not forcing anyway to pray. But if you chose to pray to whatever God or Goddess then you could. If you chose to read the latest Stephen King book then they could, if they wanted to spend that time lusting over that hot guy or gal then more power to ’em. So tell me how is that unconstitutional? I think these parents just saw dollar signs and nothing more.