var Global = Class.create(false);
Global.prototype = {
	initialize: function() {
		this.externalizeLinks();	
	},

	externalizeLinks : function() {
		var alinks = $$('a');
		for (i=0;i<alinks.length ;i++ )
		{
			if (alinks[i].getAttribute("rel") == "external")
				alinks[i].target = "_blank";
		}
	}
}

Event.observe(window, 'load', function() { var global = new Global(); });