function hideLabel(id) {
	label = document.getElementById(id);
   	label.style.display = 'none';
}

function showLabels() {
	text1 = document.getElementById("username");
	text2 = document.getElementById("password");
	label1 = document.getElementById("usernameLabel");
	label2 = document.getElementById("passwordLabel");
	if( text1.value == "" )
	{
		label1.style.display = 'block';
	}
	if( text2.value == "" )
	{
		label2.style.display = 'block';
	}
}