function external_links(){
	var links;

	// all rel='external' links
	links=document.getElementsByTagName('a');
	for(i=0;i<links.length;i++){
		if(links[i].rel=='external')
		     links[i].target='_blank';
	}
}

if(window.addEventListener){
	window.addEventListener('load',external_links,false);
}
else if(window.attachEvent){
	window.attachEvent('onload',external_links);
}