function resizeViewportToMax() {
  var x,y;
  if (self.innerHeight) // all except Explorer
  {
	x = self.innerWidth;
	y = self.innerHeight;
  }
  else if (document.documentElement && document.documentElement.clientHeight)
	// Explorer 6 Strict Mode
  {
	x = document.documentElement.clientWidth;
	y = document.documentElement.clientHeight;
  }
  else if (document.body) // other Explorers
  {
	x = document.body.clientWidth;
	y = document.body.clientHeight;
  } 
  document.getElementById('mainTbl').style.height=y+1.0+'px';
}