var ExternalLinks = new Class({

	options:{
		rel:'external'
	},
	
	initialize:function() {
		$(document.body).getElements('a').each(function(el){
			if ( el.getProperty('href') 
					&& el.getProperty('rel') == this.options.rel ) {
				el.setProperty('target', '_blank');
			}
		}, this);
	}

});

window.addEvent('domready', function() {
	var externalLinks = new ExternalLinks();
});