function hide(){
 if(!document.all) return
  var poa = document.getElementById("poa")
	poa.style.display="none"
}
function change(){
 //if(!document.all) return
  var poa = document.getElementById("poa")
	if (poa.style.display=="none"){
			poa.style.display='block'
		}
		else{
			poa.style.display="none"
		}
}