var common = {
	// set external links
	setExternalLink: function() {
		var anchors = document.getElementsByTagName('a');
	
		for (var i = 0, l = anchors.length; i < l; i++) {
			var e = anchors[i];
			if (e.getAttribute('href') && ((e.className || e.getAttribute('class')) == 'external')) {
				e.target = '_blank';
			}
		}
	},

	start: function() {
		var target = this;

		try {
			window.addEventListener("load", function() {
				target.setExternalLink();
			}, false);
		}
		catch (e) {
			window.attachEvent("onload", function() {
				target.setExternalLink();
			});
		}
	}
};

common.start();