function triggermail()
	{
	var url = escape(document.URL);
	var title = escape(document.title);
	var fullurl = '../sendafriend/sendafriend.html?url=' + url + '&title=' + title + '&site=' + escape('Nature Science Update (http://www.nature.com/nsu/)');
	window.open(fullurl,'sendafriend','width=450,height=600,resizable=yes,location=no,menubar=no,scrollbars=no,personalbar=no,status=yes');
	}