//shows/hides an id

function showhide(myId) {

  if((myId=="sub04")||(myId=="sub08")||(myId=="sub0648")){

    return true;

  }

	if (document.getElementById) {

		state = document.getElementById(myId).style.display

		if (state == 'block') {

			hideId(myId)

			return false

		}

		else {

			showId(myId)

			return false

		}

	}

}



//hides an id

function hideId(myId) {

	if (document.getElementById) {

		document.getElementById(myId).style.display = 'none'

	}

}



//shows an id

function showId(myId) {

	if (document.getElementById) {

		document.getElementById(myId).style.display = 'block'

	}

}