function menu_link(num)
{
	switch(num)

	{

	  case 1:window.location="1.htm" ;break;

	  case 2:window.location="2.htm" ;break;

	  case 3:window.location="3.htm" ;break;

	  case 4:window.location="4.htm" ;break;

	  case 5:window.location="5.htm" ;break;

	  case 6:window.location="6.htm" ;break;

	}
}