function change_visibility(ids, num) {
	var i = 1;
	while (document.getElementById(ids + "_" + i)) {
		document.getElementById(ids + "_" + i).style.display = 'none';
		i++;
	}
	document.getElementById(ids + "_" + num).style.display = 'block';
}

function confirm_drop() {
	return confirm("Möchten Sie wirklich löschen?");
}

function show_menu (ids) {
	/*var i;
	var tmp = document.getElementsByClassName(ids);
	for (i = 0; i < tmp.length; i++) {
		if (tmp[i].style.display == 'none')
			tmp[i].style.display = 'block';
	}*/
	
	document.getElementById(ids + '_cont').style.display = 'block';
	/*var i;
	for (i = 0; i < tmp.length; i++)
		tmp[i].setAttribute("display", "block");*/
}

function hide_menu (ids) {
	/*var i;
	var tmp = document.getElementsByClassName(ids);
	for (i = 0; i < tmp.length; i++) {
		if (tmp[i].style.display != 'none')
			tmp[i].style.display = 'none';
	}*/
	document.getElementById(ids + '_cont').style.display = 'none';
}