function visible(bool,n)

{ 

	if (bool)

	{

		switch(n)

		{

			case 1:

				elab1.style.visibility = 'visible';

				break;

			case 2:

				elab2.style.visibility = 'visible';

				break;

			case 3:

				elab3.style.visibility = 'visible';

				break;

			case 4:

				elab4.style.visibility = 'visible';

				break;

			case 5:

				elab5.style.visibility = 'visible';

				break;

			case 6:

				elab6.style.visibility = 'visible';

				break;

			case 7:

				elab7.style.visibility = 'visible';

				break;

			case 8:

				elab8.style.visibility = 'visible';

				break;

			case 9:

				elab9.style.visibility = 'visible';

				break;	

		}		

	}

	else		

	{

		switch(n)

		{

			case 1:

				elab1.style.visibility = 'hidden';

				break;

			case 2:

				elab2.style.visibility = 'hidden';

				break;

			case 3:

				elab3.style.visibility = 'hidden';

				break;

			case 4:

				elab4.style.visibility = 'hidden';

				break;

			case 5:

				elab5.style.visibility = 'hidden';

				break;

			case 6:

				elab6.style.visibility = 'hidden';

				break;

			case 7:

				elab7.style.visibility = 'hidden';

				break;

			case 8:

				elab8.style.visibility = 'hidden';

				break;

			case 9:

				elab9.style.visibility = 'hidden';

				break;	

		}

	}

}