function showHide(){ 
	for(i=1;i<=0;i++){
		var actual = 'parpadeo' + i;
		if (document.getElementById(actual) ) {
			var vis = (document.getElementById(actual).style.visibility==="hidden")?"visible":"hidden";  
			document.getElementById(actual).style.visibility = vis
		}
	} 
	}; 

	var myMenu;
	window.onload = function() {
		myMenu = new SDMenu("my_menu");
		myMenu.init();
		setInterval('showHide()', 1000);
	};