function externalLinks() 
	{ 
  	if (!document.getElementsByTagName) 
		{
		return; 
		}

  	var links = document.getElementsByTagName("a"); 
  	for (var i=0; i<links.length; i++) 
		{ 
    		var a = links[i]; 
    		if (a.getAttribute("href") && a.getAttribute("rel") == "external") 
			{
			a.setAttribute('target', '_blank'); 
			}
    		} 
	} 
	
if(window.attachEvent)
	{
	window.attachEvent('onload', externalLinks);
	}
else
	{
	window.addEventListener('load', externalLinks, false);
	}