function menu_link(num)
{
	switch(num)

	{

	  case 1:window.location="index.html" ;break;

	  case 2:window.location="p1.html" ;break;

	  case 3:window.location="p2.html" ;break;

	  case 4:window.location="p3.html" ;break;

	  case 5:window.location="p4.html" ;break;

	  case 6:window.location="p5.html" ;break;

	}
}