function external_links()
{
	var a = document.getElementsByTagName('a'), i = a.length;
	while (i--)
	{
		if (a.item(i).getAttribute('rel') == 'external')
		{
			a.item(i).target = '_blank';
//			a.item(i).onclick = open_external_link;
		}
	}
}

function open_external_link(e)
{
	if (!e) e = event;
	if (!leftClick(e) || e.ctrlKey || e.shiftKey) return true;
	window.open(this.href);
	return false;
}

function leftClick(e) {

  return ((typeof e.which == 'undefined') ? (e.button == 0) : (e.which == 1 || e.button == 0));

}