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 addEvent( obj, evType, fn )
{
	if( obj.addEventListener ) {
		obj.addEventListener( evType, fn, false );
		return true;
	}
	else if( obj.attachEvent ) {
		var r = obj.attachEvent( 'on'+evType, fn );
		return r;
	}
	else {
		return false;
	}
}

addEvent( window, 'load', externalLinks );