// Funktioita elementtien näkyvyyden kontrollointiin.
function displayBlock(target) {
	if (!document.getElementById(target)) return;
	document.getElementById(target).style.display = 'block';
}
function displayNone(target) {
	if (!document.getElementById(target)) return;
	document.getElementById(target).style.display = 'none';
}
function displayToggle(target) {
	if (!document.getElementById(target)) return;
	if (document.getElementById(target).style.display == 'none') document.getElementById(target).style.display = 'block';
	else document.getElementById(target).style.display = 'none';
}
function borderToggle(target, border1, border2) {
	if (document.getElementById(target)) target = document.getElementById(target);
	if (target.style.border == border1) target.style.border = border2;
	else target.style.border = border1;
}