var fading = {
	
	nav_state:'off',
	
	init: function() {
		mydiv = document.getElementById('bimg'),
		YAHOO.util.Dom.setStyle(mydiv, 'opacity', 0);
		YAHOO.util.Dom.setStyle(mydiv, 'visibility', 'visible');
	    
	    var fade_in = new YAHOO.util.Anim(mydiv, {	opacity: { to: 1 } }, 0.5, YAHOO.util.Easing.easeIn);
       	fade_in.animate();

	    var fade_out = new YAHOO.util.Anim(mydiv, {	opacity: { to: 0 } }, 0.25, YAHOO.util.Easing.easeOut);
	
	    YAHOO.util.Event.on(window, 'beforeunload', function() {
	        fade_out.animate();
	    });
	}
};

YAHOO.util.Event.on(window, 'load', fading.init);