function st_blendeaus(elm) {
	var node = document.getElementById(elm);
	var state = node.style.display;
	node.style.display = 'none';
	node.style.visibility = 'hidden';
}


function st_blendeein(elm) {
	var node = document.getElementById(elm);
	var state = node.style.display;
	node.style.display = 'block';
	node.style.visibility = '';
}

function st_blendeeinaus(elm) {
	var node = document.getElementById(elm);
	var state = node.style.display;
	if (!state) state = "block";

	node.style.display = state != 'block' ? 'block' : 'none';
	node.style.visibility = state != 'block' ? '' : 'hidden';
}