function customRel()
{
	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" ) )
		{
			if( ( anchor.getAttribute("rel") == "external" ) )
				anchor.target = "_blank";
			else if( ( anchor.getAttribute("rel") == "sendmail" ) )
			{
				var emailParts = anchor.href.split( "," );
				emailParts[0] = emailParts[0].replace( "http://www.itsdangerous.org/", "" );
				anchor.href = "mailto:" + emailParts[1] + "@" + emailParts[0];
			}
		}
	}
}
window.onload = customRel;