function _(id) {
	return document.getElementById(id);
}


function show_submenu(id) {
	if (_('submenu' + id))
		_('submenu' + id).style.display = 'block';
}

function hide_submenu(id) {
	if (_('submenu' + id))
		_('submenu' + id).style.display = 'none';
}


function externalLinks() {
	if (!document.getElementsByTagName) return;
	var anchors = document.getElementsByTagName("a");
	for (var i=0; i<anchors.length; i++) {
		var anchor = anchors[i];
		if (anchor.getAttribute("href") && anchor.getAttribute("rel") == "external") {
			anchor.target = "_blank";
		}
	}
}

function show_hide(id) {
	var box = _(id);
	box.style.display = (box.style.display == 'block' ? 'none' : 'block');
}

window.onload = externalLinks;