function showSub()

	{

		document.getElementById('submenu').style.visibility = 'visible';

		return false;

	}

	function hiddeSub()

	{

		document.getElementById('submenu').style.visibility = 'hidden';

		return false;

	}
	

	function showPop(){
		WindowObjectReference = window.open("obras.html", "popup","menubar=no,location=no,resizable=no,scrollbars=yes,status=no,height=600,width=900");
		WindowObjectReference.focus();
	}