function hideAlert(){
		document.getElementById('alert').style.display = "none";
		document.getElementById('alertcenter').style.display = "none";
}
function hideComment(){
		document.getElementById('comment').style.display = "none";
		document.getElementById('commentcenter').style.display = "none";
}
function showComment(){
		document.getElementById('comment').style.display = "";
		document.getElementById('commentcenter').style.display = "";
}