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

function do_external_links()
{
	if (!document.getElementsByTagName) return;
	anchors = document.getElementsByTagName('a');
	for (i=0; i<anchors.length; i++) 
	{
		anchor = anchors[i]; 
		if ( anchor.getAttribute('href') && anchor.getAttribute('rel')!=null ) 
		{
			temp = anchor.getAttribute('rel');
			if ( temp.indexOf('external') >=0 ) anchor.target = '_blank';
		}
	}
}

addLoadEvent(do_external_links);