function TargetBlank()
{
	if (!document.getElementsByTagName) return;

	var lnkArr = document.getElementsByTagName('a');
	for(var i = 0; i < lnkArr.length; i++)
	{
		if(lnkArr[i].getAttribute("rel") == 'external')
		{
			lnkArr[i].target = '_blank';
		}
	}
}
SetListener(window, 'load', TargetBlank);