function toggleElement(id) {
	if (o = document.getElementById(id)) {
		o.style.display = (o.style.display) ? '':'none';
	}
	return false;
}

// --------------------------------------------------------------------------------
// Add onload events without over-writing existing ones
// --------------------------------------------------------------------------------

function addLoadEvent(newonload) {
	if (typeof window.onload != 'function') {
		window.onload = newonload;
	} else {
		var oldonload = window.onload;
		window.onload = function() {
			oldonload();
			newonload();
		}
	}
}

// ----------------------------------------------------------------------------
// Use unobtrusive Javascript as an accessible replacement for target="_blank"
// to optionally open links marked with rel="external" in a new browser window
// ----------------------------------------------------------------------------

function externaliseLinks() {
	var links = document.getElementsByTagName('a');
	for (var i=0; i<links.length; i++) {
		if (links[i].rel == 'external') {
			links[i].onclick = function() {
				window.open(this.href, "_blank");
				return false;
			}
		}
	}
}
addLoadEvent(externaliseLinks);