$(document).ready(function(){
	$("a.externo").click(function( e ){
		e.preventDefault();
		window.open( $(this).attr('href') );
	});
});
	function hora(){
		var now = new Date();
		var hours = now.getHours();
		var minutes = now.getMinutes();
		var seconds = now.getSeconds();
		
		if (hours <=9) hours="0"+hours;
		if (minutes<=9) minutes="0"+minutes;
		if (seconds<=9) seconds="0"+seconds;
		var cdate = hours+":"+minutes+":"+seconds;
		
		document.getElementById('clock').innerHTML = cdate;
		setTimeout('hora()',1000);
	}