function initNavigation() {
	var a = document.getElementById("checked");
	var subnavigation = document.getElementById("subnavigation");
	if (a) {
		var offset = findPosition(a)[0];
		var table = subnavigation.getElementsByTagName("table")[0].tBodies[0];
		var edit = document.getElementById("margin").getElementsByTagName("a")[0];
		var tableOffset = 0;
		if (table.rows[0].cells.length == 3) {
			tableOffset = table.rows[0].cells[1].offsetWidth;
		}
		else {
			tableOffset = table.offsetWidth/2;
			if (edit) {
				tableOffset -= edit.offsetWidth/2;
			}
		}
		document.getElementById("margin").style.width = (document.body.offsetWidth - parseInt(offset) - tableOffset - parseInt(a.offsetWidth)/2 - 10)/12 + "em";
	}
	subnavigation.style.visibility = "visible";
}

function findPosition(obj) {
	var curleft = curtop = 0;
	if (obj.offsetParent) {
		curleft = obj.offsetLeft;
		curtop = obj.offsetTop;
		while (obj = obj.offsetParent) {
			curleft += obj.offsetLeft;
			curtop += obj.offsetTop;
		}
	}
	return [curleft, curtop];
}

function toggle(elementId) {
	var element = document.getElementById(elementId);
	if (element.style.display == 'none') {
		element.style.display = 'block';
	} else {
		element.style.display = 'none';
	}
}