$(function() {
	$('a[rel="external"]').click(function () {
  		$(this).attr({'target':'_blank'});
	});


	var fotosHome = _fons_img_gran.length;
	var rndNumHome = Math.floor(Math.random() * fotosHome);

	
	$("#masthead").css("background-image","url(" + _fons_img_gran[rndNumHome]  + ")");
	$("#fotob").css("background-image","url(" + _fons_img_petita[rndNumHome]  + ")");
});